<s>[INST] I am 45 years old .  I have been experiencing a sharp pain in my right lower side (like a pinching) along with some heartburn, belching, and lots of gas. Sometimes my lower back hurts as well.   I do have acid reflux and have always had stomach problems.  I have seen my doctor and he is treating me for IBS.  I am very worried about this, but he tells me it takes some time for this to get better (maybe months).  What I have noticed is that I feel great for most of the month, but then about a week or so before my period is when it bothers me the most. [/INST] HI.This may not be IBS as your pan increases about one week before the periods. This is more suggestive of a problem with hormonal effects. I would advise you first to get in consultation of a Gynecologist, to undergo clinical examination, ultrasonography and blood and urine tests. Diagnostic Laparoscopy can help for the diagnosis and treatment too. IF this is endometriosis or tuberculosis of the abdomen, you will need definitive surgery and medical treatment. </s>