my weight fluctuates waayy too much, please help.?!

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Firstly you should never starve yourself its not healthy at all. When you eat a lot obviously you will but on weight. However when you starve yourself your body doesn't know when its going to get food again, so when you do eat again it will store a lot of the food that your in taking as it doesn't know if this will be the last meal it has for a long time. Hence why the weight goes back on quickly. What you should do is regular exercise and everything in moderation to maintain a healthy weight.

Exercise little and often. Keep to a balanced diet of fruit, veg, lean meat and limit it to about 2000calories daily. Stay off junk food and eat regularly and never miss meals or even whole days of eating. Drink plenty of water. Your weight will stabilise and then weigh yourself no more that twice each week and stick to the same days. Mornings before breakfast is the best time.

it sounds like you have a eating disorder. make appointment with your doctor and talk to him/her.

you should go to doctors.

It's mostly water weight.
A lot of water is stored with glycogen, so when you drain your glycogen stores you also lose a lot of water weight. This can be anything up to 10lbs, if not more, so if you starve yourself you'll empty those store rapidly, and lose alot of water weight very quickly.
Then you binge or return to a normal diet, and your glycogen stores are replenished, and as glycogen is replenished so is the water that’s stored along with it. If you binge they are replenished rapidly, and you regain your all that water weight rapidly.
You’ll probably notice that a lot of diets that promise rapid weight loss only last a couple of weeks, and that’s because you can’t sustain that rate of weight loss once the glycogen stores are drained, and if those diets kept going it would ruin their illusion of success.

Basically what you are doing is draining and refilling your energy stores rapidly, which causes your water retention to change rapidly, causing your weight to change rapidly.

At its most basic weight loss is all down to your daily calorie intake. If you eat less calories then your body needs you will lose weight. In this regard exercise just means you can eat more food then you could without exercise. If you’ve no interest in exercise you just need to track your calories, and aim for between 500-1000 calories below your daily maintenance level.

You can track your calories, and calculate your daily calorie requirements on one of the following sites:
http://www.livestrong.com/myplate/
http://www.sparkpeople.com/
http://www.calorieking.com.au/
I’d strongly advise you do so to begin with as it’ll give you a greater understanding of how many calories different foods have. It might surprise you how many calories foods that people consider to be healthy and ideal for weight loss actually have. For example, 100g of uncooked pasta, which is about a handful, is around 250-350 calories.

These basic steps should be enough to get you started with your weight loss, but if you want to fine tune your diet a bit there’s more you can do. The main thing you can do is reduce the amount of carbohydrates in your diet. Carbohydrates are found in foods like pasta, bread, starchy vegetables, rice, sugar, and other foods that make up a big part of the modern diet.
The problem with carbohydrates is that when you eat them your body produces insulin, and insulin plays a major role in the production and storage of fat. If you combine fat and carbohydrates in a meal then you are providing the body with everything it needs to store as much fat as possible.

Ideally you should aim for your calories to come from 40% protein, 40% fat, and 20% carbohydrates. The level of fat might seem high, but you need to remember that dietary fat is not the same as the fat in your body. When you eat fat it’s broken down and used immediately to provide energy to the body, and only stored when you are either consuming a lot of carbohydrates, or eating more calories than your body needs. If you are on a diet this won’t be a problem. You can eat whatever you like as long as you stick to this nutrition split.

The following is a list of high carbohydrate foods to avoid:
http://www.buzzle.com/articles/list-of-h…

And here’s high protein food:
http://commonsensehealth.com/Diet-and-Nu…

Next, exercise. You don’t need to exercise, but it’ll help you get fitter and improve your body shape. I’d recommend regular cardio exercise, such as jogging, or jumping rope, but high intensity stuff like Zumba will do as well, and if you enjoy it that’s even better.
I’d recommend 3 sessions of cardio exercise a week at a minimum, and if you are going to start jogging then I’d recommend the Couch to 5k plan, which is ideal for beginners :
http://www.coolrunning.com/engine/2/2_3/…

If you want a great body shape you should aim to go to the gym 3 alternate days a week, and remember the key to building muscle is doing a few sets of a low number of reps at the highest weight you can manage. People who pick up tiny weights and lift them 250 times are basically doing very inefficient cardio exercise that doesn't do anything to build muscle.

With weight lifting it depends whether or not you have access to a gym. If you do I suggest you follow a plan like Starting Strength, the wiki of which is full of very useful information : http://startingstrength.wikia.com/wiki/S…
The actual programme is here : http://www.startingstrength.net/workouts…

If you don't have gym access read Brain over Brawn, a free ebook, which contains lot's of useful information about dieting and weight loss : http://brainoverbrawn.com/get-the-book/
I highly recommend you read it regardless of your plans, as it will educate you on what is required to lose weight.

Lots of research and personal experience.