About a month or so ago, I left a room packed with people at a dorm building meeting. I didn't leave the whole meeting, I just stood outside the door and listened rather than stand there in the whole room full of people. Even just sitting outside the door though had me shaking and feeling nauseous.
Weeks before that, I tried to eat in the dining hall. Oh that was fun. I sat alone near the window and the wall, but even then I felt like bursting into tears and I started to panic with everyone around me, so I left with my meal half finished.
Even over the summer at one of my friend's grad parties I ended up going into the camper she had out back just to regain myself. Spent about 15 - 20 mins. in there trying to calm myself down. Thankfully no one noticed I was gone during that time. :
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It's happened to me quite a lot, but most of the time it's just going somewhere else to gain control, rather than actually fleeing the scene completely.