At the time you are having a fever, get a thorough check-up in a hospital, not just LifeCare. At the time you have a fever it's hard to believe all other values will be normal.
Also chest X-ray, respiratory panel, abdomen ultrasound, blood cultures, heart echo. All to be done when you are having a fever. Bring the results from LifeCare as comparison and because some examinations don't have be repeated.
Do an ATK for covid first, from 7/11
These episodes (this is the third episode, right?) may not be related, but could be, and it can be many things.
Pattaya Memorial Hospital, or if money is no object, Bangkok Hospital.