UCL injuries need to be diagnosed with MRI, not just x-rays. The “medial epicondylitis” could have been inflammation of the pronator muscle tendons attached to the medial epicondyle. Also, “medial epicondylitis” is a term sometimes used by medical personnel who aren’t sure what the problem is.
It does not appear to me that you were thoroughly or accurately diagnosed. You need to (1) stop throwing, (2) see an orthopedic surgeon trained in sports medicine, and (3) not throw again until said orthopedic surgeon clears you to throw.
You can ask Dr. Fleisig of ASMI to recommend an orthopedic surgeon in your area. Dr. Fleisig’s contact info is here: http://www.asmi.org/fleisig.php