Violets, thanks for sharing your dream, I find it really interesting.

You were in a grocery store, found money in the bathroom, then bought cookies. Usually one might "lose" one's cookies in the bathroom, a switch of sorts? Then you are in a laundry, where one would do "dirty" laundry (or launder money) but you don't want to do that, you're keeping your dirty laundry?

The attic in a building usually means one's intellect/head/thinking, etc. You went from the bathroom and keeping cookies (not only not throwing up but working hard to not throw up, spending energy (money) on keeping your cookies) and dirty laundry to being in your head, then you're suddenly lost. Sound anything like your actual experience?

Your teachers didn't stop, didn't let on if they saw you, didn't see you or help. Then a strange guy shows up and says he'll help you but turns out he is trying to take advantage of you, calls you some other name (which could be the DID and another coming out to deal with this guy?).