Frequent burping after taking 3 days of antibiotics

Hi all,

I’ve had the problem of burping for 6 months. 6 months ago, I suffered from sinusitis so my ENT doctor prescribed me an antibiotic - Zithromax. I finished the 3-day course, but since then I always burp after eating, especially after drinking water. I burp around 20-30 times per day. I know it’s not a lot, but before taking the antibiotics, I only burp around a few times everyday or only after eating some food that is difficult to digest.

I’ve read up some post here and hopefully looking for some insights or home remedies too. I swear I’ll never take any antibiotics again unless I’m dying. There’re a number of possible causes - gastritis, silent reflux, dysbiosis or excess of mucus stuck in my throat.

Here’re my symptoms right now, - post-nasal drip (mostly white) - burping more often than before

1)Should I go for a endoscopy? I’ve got tested by rhinscopy for 3 times but my ENT doctor just said I'm fine and my sinusitis healed on its own, though I doubt if it can.

2) Is there any home remedies I can take or diet changes I can make to relieve my symptoms?

Thanks a million all🙏🤧