Post Covid Symptoms Help. Ur opinion.

Myself Rahul Srivastava from Allahabad up, I had covid, I was admit in hospital 11april with same day positive report, as same day my oxy level 50-60, treatment was started in hospital with oxygen mask, my antigen report was negative on 15april, rtpcr was negative on 18april, I was total 10days in isolation ward, afterthat shifted in non covid ward with oxygen bed for 11days, in last 4 to 5 days in hospital I was also practice to live without oxygen and I got it, now last 8 days I m in my home without oxygen, my oxy level goes to 97-99, but normal constant to 94-95, but I try to walk for 5min then it down to 85-88, sometimes light pain in left side in chest, if I had sometimes muscular pain last 6-7 months, but now i confused that this pain is muscular pain or anything else, I had also test CBC & CRP, CBC almost normal, CRP alue is 1.23 outof 5 before 12-14 days, in hospital with treatment 6 pcs heparin injection dose given to me, plz guide me and prescribed medicine as per ur opinion.