piriformis syndrome
The Sciatic nerve runs either under or through the piriformis & Gemelius muscles if these muscles have been damaged and are in a state of contracrion, when ever you climb stairs sit down it will hurt , stand still with both feet together keep one foot still and rotate the foot on the bad side outwards without turning the body, if there is exesive pain the sciatic nerve has been trapped and referal pains will manifest themselves in the big toe, on the medal insde of the heal, down the shin tibia, the hamstrings will feel tight, and you will get pain radiating on the inside of the back of the knee. this wiil effect the ITB if these are some of the symptoms or all try a remedial therapist. The other possibility is the sciatic nerve has been nipped between lumbar 4 & 5 then this is a job of a good osteopath, Your problem is definatly Biomechanical and the foot strike on your bad leg will be very imbalanced, you seem to be having a hard time of it. I PRAY YOU GET SORTED. all the best