Continuous Belching. Please advise!

I underwent a left Ear surgery (Tympanoplasty). I had been given strong antibiotics and pain killer for 7 days. I have been sleeping straight and right side for more than a month. 11 days after my surgery that was on 03rd Oct'24 I started getting belching and right side of throat feels full. Then after few days belching has become strong and continuous like a force along with little gas and bloating. Also end of Oct'24 I observed stool was green in color. After 2 weeks stools became brown for few days and then brown sometimes and then green sometimes or mixed. Now bloating is very less but belching is the same along with something feeling stuck on the right side of the throat. I have taken Dompan twice a day for 14 days, then Omez dsr for 18 days along with Mucain Gel syrup for 10 days, now on Omez D+ for 18 days. I have good appetite. Please advise