Another good reason to find the real diagnosis is that it may help you identify the cause. The doctor or therapist or whoever should know what actions are generally associated with your particular problem.
I'm not sure about the idea that any treatment could help over and above eliminating the cause - except with pain. As I said, NOT treating the pain has always been an invaluable guide to me in making changes necessary to stop causing the damage.
I've heard cross-frictions touted before, but I've never seen the claims made about freeing adhesions or re-aligning scar tissue substantiated. It might be worth a try so long as the cross-frictioning sessions themselves don't become so extensive as to be suspects for causing further/worse damage.