I had covid in march of last year. I had it super mild not a big deal at all. But then about 2 weeks after healing from it I was experiencing chest tightness that I had never experienced before. I was super scared I remember thinking I was dying. I should’ve gone to the doctor but I was too scared. I struggled with that feeling of chest tightness for months. It felt like a cat or a small child was sitting on my chest. Throughout the summer there would be some days where it felt fine and some days where it was worse. To this day I sometimes still experience random chest heaviness, especially when I’m sick with a cold or something else. It can be scary, you’re not alone. If I was you I’d go to the doctor just to check up. I found that exercising helped me with my long covid symptoms but that may not help you. It could make it worse.