Chest tightness. A normal life soon.

Hi Doctor, I'm a yoga trainer and a student. I'm unable to do yoga or pranyama or any fitness activities. After doing so, my ribs hurt for few days and then it gets better. But it seems to be different from soreness as I've been into sports and asuch ribs  tightness i have never felt it Even after lifting weights in the gym before. I'm okay when I'm doing my work and distracted but when my attention goes to my chest, ribs or to breathing it gets messed up then. I start to get concious of my breath and then i feel the tightness. I've done X ray and dr said my chest is absolutely fine. Dr suggested you're thinking alot about yourself. I was down with corona in August first week and since then it had affected me. Although I wasn't positive but " detected" as per my CT PCR test. But the fear, anxiety and overthinking is still there . I just want to get my this feeling out so that i can do my acitivties yet again and live a normal life soon.