Definitely tell your therapists and helping team all you can about your background history and suspicions now.

Dx's can take awhile and/or change over time as more experience (with meds and therapy) shows different aspects than were seen before, etc. It can need "tuning" :-) It's not a static thing and is useless/meaningless without your participation since they're working on what will help you feel better.

If they feel it is "just" depression, work with that awhile, I've done lots of groups, try not to worry about what the others think of you but on yourself and getting better!