mapsaj, Bless his heart and yours too. Long COVID can have so many different syptoms for different people. Speaking from experience it can cause an uptick in GERDS (Reflux). Is there a COVID Recovery Clinic in your area where he can be checked out?

Questions:

1) Has he been checked for Mono (Epstein Barr Virus)?
2) Has he had an endoscopy with a Gastroentestinal Doctor to check for escalated reflux or hiatal hernia?

Praying for him and you. I'm so sorry he is battling this.