I have been experiencing really bad stomach pain due to constipation over the last few months. i've had it for years but it has never bothered me.

Chronic Constipation: Chronic Constipation for few months not treated can cause abdominal pain.For us to advice you we need more history,if you have used any laxatives etc.Well i suggest you use a laxative like miralax with stool softner.Diet rich in fiber,whole grains,fruits &vegetables & plenty water everyday.Sometims you may have to use Suppositories or enema in the brginning id you have fecal impaction.ConsultMD

Constipation : Prolonged Constipation if not corrected can cause diverticulosis ( wrinkles in intestine lining ) . These diverticuli can get inflamed and can cause pain , fever and sometimes can be life threatening . Dietary changes ( high fibre diet, lots of fluids) should be made , laxatives can be tried but consult your doctor too .