It does seem anxiety triggered Braden from how you describe it, I'd get a medical opinion to be sure. I have anxiety problems, but it manifests in a different way for me, mine's more typical panic attack reactions; head goes muzzy, cold fear grips me, and then when it releases I feel exhausted and light headed. I have to get outside if possible, or at the very least open a window to get some air. When I was first diagnosed with it they tried beta blockers but they made me worse, I was having to get off the bus halfway home and walk the rest of the way cos I felt so anxious and trapped. Or sitting outside in the early hours of the morning cos I felt better outdoors.
Horrible things to experience and I know there's quite a few on here who suffer this. I hope you get some resolution