Should I be worried???

I had covid and was home for all over December getting over symptoms. Finally tested negative and felt better so I went to target. Walking around caused heart palpitations to the point I had to stop and hold myself up against the cart for about 20mins. I couldn’t breathe I was almost hyperventilating trying to catch my breathe. The roof of my mouth felt like pins and needles and I could feel my heartbeat in my head! I drank water and left the store. I’m home and it’s still happening while just sitting . What’s going on?!