I've been very fortunate to have my fiance. He helps talk me through a lot of my anxious breakdowns, reassures me, understands my quirks, etc. Same with my mother and same with my father. Honestly, I'm surrounded by a lot of people who are very encouraging and supportive, that listen to me when I talk, and that I can relate with. My father, my fiance, my friend Sarah, and I have all been through anxiety/depression or are still going through it, coping, and so on, and it helps a lot to talk to someone that gets it.
Also everyone on these boards! It's so comforting to find people whose brains work in a similar fashion so that you know you're not alone, and yes, it really is the mental illness that's doing this!