Went through something similar. Started out as outer knee pain, than iliotibial band syndrome, than piriformis syndrome, psoras muscles, a whole Gray's anatomy of tight muscles. Tried all sorts of exercises, stretches, yoga, riding, not riding, heat, cold, chiropractors, different bike fits, cleat positions, saddle heights, platforms etc etc etc. Even tried a recumbent
Finally got an xray for an unrelated back injury and they discovered I need a new hip. No cartilage and one oversized bone spur.
I have an appointment with a surgeon in an hour.