What is wrong with my left leg, chronic pain?!

See your health care provider as soon as possible (orthopedic surgeon), for consultation. Most leg pain result s from wear and tear, overuse, or injuries in joints or bones or in muscles, ligaments, tendons or other soft tissues.

Other conditions can also cause leg pain; blood clots in the veins of your legs (deep vein thrombosis) or varicose veins can cause pain, swelling and even open sores. Narrowed arteries can reduce blood flow to your legs, leading to pain that gets worse with exercise and improves with rest. Infections, too, can cause leg pain.

Some common causes of leg pain include:

Achilles tendinitis
Achilles tendon rupture
ACL injury
Baker's cyst
Bursitis
Chondromalacia patella
Claudication
Sciatica
Sprains and strains
Tendinitis
Varicose veins
Pseudogout
Rheumatoid arthritis
Thrombophlebitis

Leg pain can be constant or intermittent, develop suddenly or gradually, and affect your entire leg or a localized area, such as your shin or your knee. It can also take a number of forms--stabbing, sharp, dull, aching or tingling.

Some leg pain is simply annoying, but more severe leg pain can affect your ability to walk, put weight on your leg or feel stable.

Listen to the pain message and try not to do anything that aggravates the pain. If you have arthritis, make sure you are taking your medication as directed. Otherwise, acetaminophen, aspirin, ibuprofen, or naproxen may be used to ease the pain, until you see a doctor.

I hope this helps you. And good luck.

Because of the different areas you are having the pain it sounds like you have tight muscles in your lower back pressing onto the nerves going to your legs to cause those pains. You can free up the back muscles which will remove the pressure from the nerves to get rid of the pain and here's how to do that:
Back:
(do from a sitting position)
Place your left hand on your left leg next to your body. Place your right hand over your left shoulder, fingers over the back and the palm in the front and firmly pull down on them and hold. After 30 seconds slowly lower your body forward and to the outside of your left leg, keeping your left arm fairly straight as you do. When you reach your lap remain there for another 10 seconds, release the pressure but rest there for another 30 seconds. Then reverse your hand positions and do your right side.
For best results relax your body first by taking a deep breath and exhaling then remain this relaxed.