Thats exactly what i have/had... Get yourself a foam roller and roll out all those tight muscles in your leg/hip/lower back... stretch only your left side compared to the right, i have an inversion table at home and i hang myself by my tight leg and it does wonders, but its gonna take time to get back to 100% but after 3 months of doing this routine every day i can keep up my riding and its slowly getting better. if you have this stay away from all those one legged pumping tricks on your bad side because you have a strong side and weak side and maybe this affected your pelvic balance. You should go see an osteopath because my pelvis was tweaked to one side (mind you ive been riding 10 years)... read up about it on the net... golfers and baseball players have the same problem, from lunging always on one leg. 2 years ago it got so bad i had to stop riding and get therapy, now its a minor ache but an annoying one in fact, it was so bad i thought id have to quit... just relax on your riding and take care of yourself, peace