Golfers Elbow is known in the medical world as medial epicondylitis. It is exactly the same pathological process as tennis elbow, which is to say it is an enthesopathy (deterioration of the enthesis or the point where the tendon joins to the bone), but instead of being on the outside of the elbow, it’s on the inside.
Like any tendonopathy or enthesopathy, rest does NOT help. We need to ice regularly (at least 2-3 times per day, especially after exercise) and then complete a gradually progressive series of eccentric wrist curl type exercise to stimulate tendon repair. These exercises are to be completed REGARDLESS of pain, within reason. Tendons are made up of collagen fibres, and don’t have many cells to mediate repair or healing, so the eccentric exercise stimulates what cell matter there is to repair the micro-tears.
Using a tennis elbow strap can help, by dispersing the load on the tendon attachment from forces acting on the wrist. Your Physiotherapist will treat the tight forearm muscles to reduce tension, including massage, dry needling and stretching. Even well managed, they can take 3-4 months to resolve, but without treatment they’ll plague you for years, and gradually deteriorate. See your physiotherapist if you think you have this debilitating condition.