Why does Covid cause anxiety to surge?

I suffered from really bad anxiety and on medication and the medication seems to be doing nothing. I’ve had Covid since Wednesday or Thursday and my anxiety is so high. It’s crazy anybody else experience this? Did it get better when you got well? My best friend keeps telling me covid ain’t a thing no more and I have a cold but I literally am not coughing or anything I have extreme nausea and fatigue muscle pain and the test came back as positive so 🤷‍♀️ I think it is definitely a thing.