The right professional would be a sport physician ( doctor who specializes in sport related injury), but this case can be seen by any orthopaedic surgeon or even normal clinic doctor who has enough knowledge,

So golfers elbow happen in the inner part of your elbow, due to injury
During racquet sports or heavy lifting or constant vibration from drilling
You Can refer to this link, for the test to confirm if its golfer elbow( medial epicondylitis)
https://youtu.be/WBBiJYYtf5o
Usually an x ray is done to rule out fracture initially, then we cn confirm diagnosis by clinical examinations however mri would be the best modality bt unnecessary
Since its been 3months and healing, a gradual strengthening exercise should be done for your rehab, another method to relieve it is to go for SINGLE low dose steroid injection, done in many athlete to reduce the inflamamtion and hasten healing
A warm pack can help the soreness and elbow brace when doing activity to distribute the load

Do also note that steroid injection is not the same as anabolic steroid taken by gym users