I have been having pain under my ribs and constant burping for about six months now. Countless trips to the Doctors along with my own Google research, I was finally tested for B12. I was deficient and put on 6 loading doses in 2 weeks with follow up boosters every 3 months for a year. I had a test for pernicious anemia which came back negative. Mostly my symptoms have gone. I am suffering still with burping and rib pain. After my second booster it went away. I had an ultrasound which found calcium on my spleen but no enlargement. Since then I’ve had various bowel and tummy issues including constipation and undigested food in my stool but no burping or rib pain. The doctor prescribed me Omeprazole on Monday which I have read lowers Stomach acid. The rib pains and burping have returned. Is it possibly stomach acid related. Could these be B12 deficiency too? What could be the cause of B12 deficiency if not Pernicious Anemia?