Pain In left side of chest. Else!

Hello, I was a covid patient in the month of April and got recovered in the month of May. I was having mild symptoms. Since 4-5 days my stomach was full tight even the toilet were not clear and was having acidity . Taken rantac 150mg and since yesterday the stomach is now normal . But I am having pain in the left side and in the middle of the chest. Don't know it's due to gas or something else. I have measured on oxymetr spo2 level is 97 98 and heart is 68-90 Issues Mild pain and discomfort in left chest and shoulder and middle bone of the chest Acidity Frequently urination in a gap of 1 hour. I have done the blood test for sugar thyroid vitamin d calcium platelet etc all reports are normal. Please suggest something to get rid of this pain and this is due to gas or something else