(tested negative for covid)sometimes I’ll be doing nothing and feel like I can’t breath or feels like my heart skips a beat. While at work I’ll barely move and I have to catch my breath & today I got dizzy and lost my vision for a few seconds. I took a Tylenol pill and didn’t help :/ why am I feeling this way and what can I do to help? I do stand mostly at work but I can sit eventually too 12 weeks 3 days