What are the negative affects of continual(sp?) stress?!

What are the negative affects of continual(sp?) stress?

I know stress can cause health problems make you gain/lose weight, sleep problems etc. But i wanted to know what are the side affects of long term stress. simply, i've had a very stressful 2 years. I usually handle my stress by freaking out and crying and not getting enough sleep. Sometimes I burn (weed, yes i know dont give me lectures) which I only tend to do when these situations happen. I can't see any other way other then punching someone in the face, to deal with it. I'm starting to get grey hair and I'm only 21. So pretty basically, what else is going to happen, if i cannot avoid this or handle it in a better way?

You will begin to experience extreme headaches and stomach pains (it may even begin to develop into a stomach ulcer which will result in extreme stomach pains. The greying hair will only get worse if you don't calm down. Take it from someone who has a lot of stress (I work in law enforcement) and I can tell you that I started going grey at 20. You need to find a diversion to deal with all of your held in stress or it will just get worse.