While ALPA might help you, if you're a member, don't count on it; ALPA doesn't necessarily help anyone. You help them by paying them...but that's another story.
I'm not sure why the AME was involved until your next required medical exam. At that point you are required to list all visits to health care professionals with a few exceptions. When the treating DR said that I was OK to return to flying and I felt there was no limiting reason that I couldn't safely return to flying, I would have just returned to work.
In fact that is exactly what I did with a broken foot. I went out on medical leave from work, when the DR said I was good to go, I simply returned to work. Made the necessary disclosure on the next FAA medical application.
As for ALPA, I don't usually have much good to say about the association in general. However, if you are an ALPA member the AeroMedical office in CO is a great asset & should be the first place you call (NOT THE FAA) if you have any questions about medical issues. I would never suggest denying or covering up any medical issue that is required to be disclosed, but the ALPA AeroMedical office will assist you with what & how to disclose any medical problem. If the situation should keep you from flying, the AeroMedical office will tell you what you need to do so that you can return to the cockpit.
You mentioned that you called your ALPA medical rep, if you mean another pilot with your company, don't wait for him/her to call you back. Call the ALPA AeroMedical office directly. Their number should be on the ALPA website or in the magazine. If you can't find it let me know I have it somewhere.
When you do call the ALPA office, a very helpful person will take your membership information and will want to know at least some basic medical info. That info is passed on to 1 of the staff DRs who will call you back directly to dicuss your situation.
Good luck.