Stomach Problem After Appendix Operation

My Mother used to Eat Non-Veg at Age of 30 Years after that she is not Eating Non-Veg Now and as per my knowledge due to that Appendix Operation Takes Place to Remove that Cell which is Used For Digest Non-Veg But After Operation if She Eat Very Light Food that will not Digest to Her and Even It Start Problem in Stomach Pain and Stomach will tight and Also Urine is very Rare... She don't have backside teeth but I don't think Not Chewing Food is the Problem of Stomach Ache ... We have Already Visited Many Doctor one them who Ask us For Endoscopy in which He only Find Blister in Stomach we have Taken a Plan of 2-3 Months Treatment but After Taking Medicine She Feel very weekness ... We dropped that Plan and After that 2 Times in a Month we need to Visit Government Hospital in Night or Day For Only Pain Killer I don't know what is diease she is Having .. we are Ready to come anywhere in India .. I need a Experience Doctor and Expert Advise on my Problem.. Thank you If You Read Till End 😊