Has anyone had a panic attack for the first time (or not even necessarily for the first time but just a bad one) and it changed their anxiety/physical anxiety symptoms?

I had my first ever proper panic attack in January of this year, it was awful and I went to A&amp;E thinking I was dying. 

A bit over a month went by and I was fine, but then suddenly out of nowhere I got an insane head rush when I was trying to sleep. It disappeared when I opened my eyes, then came back again when I closed them. It caused me so much distress and I had no idea what it was. I was having anxiety attacks and was in a constant state of alertness and worry. 

Ever since then i’ve had constant light headedness/brain fog/just feeling completely spaced out type of feeling. I’ve been on constant alert wondering if I’m feeling dizzy/spaced out and it’s just progressively gotten worse from there. I feel tired all the time and mildly disassociated. It’s honestly ruining my life. I’ve had multiple tests done and they’ve all come back clear.

So i’m wondering, is this all just my anxiety having gotten worse after that intense panic attack? I need to know if these physical symptoms are due to anxiety or not. Any help is really appreciated! &lt;3