Hi fellow misophonics!
Nodding along in agreement to the concept of the adrenaline dump - oh yes.
I'm neurotypical and have no anxiety or depression, but have been misphonic since I was a young child. My triggers are eating noises, sniffing, coughing and laboured breathing noises. I've left jobs and broken up with boyfriends where the noise has been outside my range of tolerance 
Thankfully I am not as severely impacted as some of you here. I manage to cope on the train commute with earphones, and at work, where there is a cougher/sniffer on the next bank of desks with earphones/earplugs/running away.
It sucks. And people think you're being a princess. I just say at work "I have to put my earphones in now, sorry. I know it makes me sound a bit odd, but I can't filter out ambient noise and it helps me concentrate".
I just don't go to the cinema for fear of popcorn/nacho chomping. I used to live in the Middle East and I went to the cinema all the time in Ramadan, when you can't eat during the day - it was HEAVEN! Not a chomp or rustle to be heard 