I got fever of 100 on 5th Jan, and tested myself for covid rtpcr on 6th, which inturn comes positive on 9th Jan.  I also tested Negative via Rapid Antigen Test on 15th Jan as i had no symptoms, Today being 22nd Jan(18th day), suddenly i wake up and after taking break fast, it start mild pain in just small part of right chest, still sometime it is gone, but come back 2-3 hours, my spo2 level is above normal, i have no other problem,  yaa... in the evening today, i feel a little bit of exhersion, which was gone after taking dinner, is it a serious problem???? [Note that : Since my teenage, i had serious gastric problem which was not cured till now] Today is rainy day outside, and it is so cold.