It sounds like you have got chronic Tendonosis in your elbow which is the same freaking thing I've got in both arms(4-5years now)
In my case....if I stop all activities..It actually gets worse.
I will actually be doing GH under a doctors supervision to try and eliminate this issue as he and I feel it has good potential(especially if you have not torn the tendon before).
I will be starting at 2-3Iu's per day and may not go above that.
Try the search bar. There are lots of people on this board who have cured there chronic tendon problems by cycling GH.
Do more research on how GH works and you will see why it makes sense that it could work wonders for tendons.
Pitching at your level is demanding on the elbows for sure, but it is something that you will have to try.
Also...GH takes time before it really starts to have an effect. Usually 3-4 months for most, so it is something that would be a long term project IMO.
Besides injecting it 5/2 ed(sub Q)..I will also be having my doctor do spot injections into the tendons which others have reported great success with for tendon problems.