I've felt this way sometimes.
Post above me^^ Mentioned blood sugar. Yesterday I was trying to unscrew something for my mom and I started freaking out, asking if it was really hot in the house, etc. I was sweating and almost passed out. I had only eaten a bunch of chocolate that day so I assume it was just a blood sugar/ food issue.
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Do I have HFA? Nope, I've never seen a psychiatrist in my life. I'm just here to talk to you crazies. ; - )