<human>: Can you provide a brief overview of the text?

I tried to google this but to no avail. my sister and I suffer from what we call "people-claustrophobia"--when we are surrounded by people, whether we know them or not, we get nervous and flustered.

this isn't fear of crowds or anything, we're both fine with packed concerts and crowded streets. my sister suffers from some mild claustrophobia but I'm fine with anything from air ducts to submarines. this also isn't fear of people or being touched, etc; I'd say I'm fine with more touching by people who aren't my family and girlfriend than most. group hugs don't bother me, even when I'm in the middle, as long as I was expecting and have no abjection to being touched by any of the people in the group.

I can't speak for my sister but when I am surrounded and it's more unexpected or undesired, I get hot, nervous, edgy, and my heart rate increases. I probably turn red but I don't know that. I start feeling like I want to cry, and am extremely uncomfortable and short of breath. 

a couple examples:

I was signing up for something on a document posted on a door, and a bunch of people, all of whom I know, came up behind me and started trying to do the same. very quickly I started feeling the symptoms described above, and I had to duck out before I even finished writing my name. none of them were touching me, if memory serves.

more recently, I was participating in a group picture, again surrounded by people I know and like, and as we all squeezed into the picture frame one of my best friend's arms started touching mine, the wall was at my back, and there were people all around to my other side and front. I got my symptoms worse than ever before. I couldn't breathe. I had to leave before the picture was taken and go to the bathroom to splash water on my face and try to relax.

I realize both of these examples include a wall but this happens when it's just people surrounding me too. and again, I don't really have any fears of being trapped or in enclosed places. basically:
<bot>: I get nervous and stressed to a rapid and extreme degree when surrounded by people who are a little too close for comfort on most or all sides.