Left knee, left foot pain. To 8 floors.

Doctor, I was diagnosed left knee right ligment tear 5 yrs back since then i cannot sit or put my leg in same position for 2 hrs, ex: watching movie.now a days i have pain in left foot bottom backside, early morning it is very paining when i get out of my bed. Pain is also reflecting in left knee and also i feel sensation in left hip, pain is almost all over from knee to foot, now it is in left foot uder last two fingers also. One more thing doctor i have pains all over my body most of the times, especially left shoulder, left elbow, neck and some parts of my body . I feel tired , daily i travel 45 KMS in bus to work and walk for 2 KMS to go and come to work, go up and down via staircase for 6 to 8 floors.