Would a doctor recommend exercise since my back hurts so bad everytime i walk. everytime i walk my back is in extreme pain. this is because i'm obese. what treatment would i recieve?

Alternatives: I commend you on taking control of your health with walking. Consider non-weight bearing exercises at this time such as stationary bike or swimming. If you are having significant back pain, see a sport med doctor as your pain may be more back spasms, lack of flexibility, posture. Have a specialists take a look at it. You may require some therapy to strengthen your core muscles as well.

It depends ..: As in it depends on the cause of your back pain; sometime physical therapy is helpful sometimes other interventions are necessary. But if walking causes pain, consider trying an alternative form of exercise, particular those that are less weight bearing/tough on joints/spine. Think about water based activities like swimming or water aerobics. Best of luck.