Oh, my goodness!! Suzie! I had no idea about all these potentially negative effects! I suspect I'd have experienced all of them, now that you mention them. I'm terribly sensitive to sound (and everything!).
I had the same sort of experience you mention but it was some sort of meditation circle that absolutely SUCKED!! It was a very small little room with about six others who had all been going regularly. I was the only new kid.
The woman did a VERY LOUD singing bowl that was horribly upsetting. I covered my ears through the whole experience (there was more ... ) Like you, I didn't think I should leave.
Hm, thinking I ought to write about this, as it has just brought to mind something that's important to share.
Thank you for sharing your story!