I've gone to a series of physical therapists. They all offered me extremely generic regimens of stretches and exercises that had little impact on my pain. None of them suggested any particular diagnosis or escalation options. Just... it's not working? Well, how about you pay for a few more sessions?
Edit: I have long ago bought all the desk jockey ergonomic accessories -- a standing desk, a split keyboard, a floor mat, a balance board, an ergo mouse, long walks twice a day. They made no difference.