This happens to me quite often. I prefer to talk to people in quiet places because I can't focus. A month or so ago it was really bad... I was in my Photography class, but class hadn't started yet and EVERYONE was talking. I felt like I had to listen to everything all at once and I was already really anxious, so I got even more anxious and started to feel sick and get really warm. Thankfully the teacher got there and everyone stopped talking and we shut the lights off to look at photos.
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Diagnosis: Major Depressive Affective Disorder, Generalized Anxiety Disorder, Mild PTSD, Agoraphobia with Panic Disorder, Attention Deficit Disorder of childhood with hyperactivity (more inattentive, though), Mild OCD, Social Phobia, Tourette's Syndrome