I get those mini panic attacks with horrible physical feelings too! They come on totally randomly, even when I'm not anxious at all. I can be watching TV or whatever, and, suddenly, this wave of unpleasant physical sensations washes over me, and it's that which makes me anxious!
I'm sorry you're dealing with this too

Definitely the mini panic attacks are easier to deal with than the full-blown ones, but they are still no fun. I hope today was a better day for you