When pitchers have Tommy John Surgery it is for a UCL sprain. The degree of damage can be very minor up to a complete tear of the UCL. Ligaments generally heal all but the most minor damage with scar tissue so the ligament often remains susceptible to further damage after conservative treatment.
You need to see a doctor who is intimately familiar with UCL problems and pitchers. I'd recommend going to asmi.org and using their forum to ask about specialists in your area. In fact, given that you can go to ASMI you should be able to go see Dr. Andrews. He's one of, if the not the best in the world with UCL injuries.