I cant tell-I'm just so frustrated

Are these meltdowns or panic attacks? I've been dxed w/ clinical anxiety and i have suspected I'm an AuDHDer for a while now. I feel like there's a buildup of stress and panic at times, and I will ask a question frantically. When I don't get an answer, they'll be more of a buildup till I explode. I've been told these are panic attacks: I cry a lot, can't talk well, my brain goes crazy. I can't remember if there are physical symptoms, sadly. I'm also not sure if I am just an introvert or maybe autistic. My mother is an introvert, and she says that my eye contact problems and social stuff are just anxiety mixed with me being an introvert. After socializing a church and plasting on a fake smile, I'm so drained. Every word feels hard to get out, and I usually just tell her that I don't want to talk. It feels like cold water is poured on my insides and I withdraw until I get alone time:usually me talking to myself for hours. Is this a shutdown?