over size garment for bridesmaid in modest style

Someone help me here, while sitting in my truck in the PT office parking lot, I had a sudden onset of extreme lightheadedness and dizziness. Like I thought I was about to pass out. And as soon as it hit, it was gone. Pulse felt regular, maybe a little high. Took BP meds this morning and have had 0 problems all day. Just felt really weird and strong enough to concern me over size garment for bridesmaid in modest style