7 weeks 2 days

I nearly fainted at Walmart today .. We were paying I felt like I couldn't breath I sat down where they bag the stuff and I was trying to catch a breath I got super dizzy light headed we walk out into the parking lot I got some air laid the seat back in the truck and felt way better! What should I do call my doctor tomorrow or is this normal Should i just just relax.. I'm so scared I hope it never happens again 😢