First point; AUMB is the Aerospace Underwater Medical Board (aka "Toronto") that is part of CFEME Toronto, part of DRDC (IIRC). Short version; only AUMB can award permanent medical categories for aircrew, drivers, submariners.
Next, I just want to make sure you know the difference between a G3 and a G2 (min requirement for AES Op). You can read them here. https://www.canada.ca/en/department-national-defence/corporate/policies-standards/medical-standards-military-occupations/medical-category-system.html
I don't know (and encourage you to not disclose on a public forum) the circumstances about medication use, etc but I think you are taking the correct approach, but would amend it to "...to discuss this issue with the Doctor...." to "discuss with a flight surgeon if possible". I don't know if you have access to one, but they (in my experience) look at things a little differently than someone not trained in aviation medicine/occupational medicine.
If they are supportive of your points, then maybe further action can be taken with a specialist, etc to satisfy AUMB. I am curious if they indicated "not fit AT THIS TIME"...vice "not fit" suggesting a permanent "blocker" to the required MedCat for AES Op. There is a difference.
I'd highly encourage a well-thought out conversation with a flight surgeon if possible, and maybe they will support....if they can, or the Base/Wing Surgeon, reach out to AUMB and ask for clarification if anything can be done to secure a G2 determination...maybe "reapply after 12 months" will be the answer. Then you can decide "wait and pursue" or throw in the towel.
:2c: