I developed high ANA post covid too, but anticentromere antibodies. However, I've been diagnosed with diffuse systemic scleroderma (rare with these antibodies- it's usually limited). Was prescribed cellcept, but not taking it for fear past shingles or Lyme diseases will rear their ugly heads. Low Dose Naltrexone has helped soften most of my skin (shoulders, chest, thighs). Only upper arms, hands, feet/ankles still tight, but somewhat even there better. Lots of telangiectasia (mouth, hands, shoulders, chest, thighs), but so far no obvious internal involvement based on PFT and echocardiograms. Yes, I agree it's scary. I'm 60 so late to get this diagnosis. Good luck. I recommend Reddit or Inspire for better communities.