Hello, I am a 43 year old woman, I am 6 feet 5 inches tall and 390 lbs. I work as a medical transcriptionist and so I am sitting for prolonged periods of time, when I get up to go to the restroom or get a drink I have pain over my knees and in the area of my hips, what might be the cause of this? Also I have tried walking/exercising more thinking maybe that would help but after I do that the next morning I am so sore I cannot hardly move, any idea of what might be going on? At night, my left knee or the area around my knee throbs and hurts making it tough to get comfortable to go to sleep. I have not had any injuries that I am aware of that would cause this kind of pain. I have not fallen nor have I been doing any heavy lifting etc. Please help!