I feel for you. >: I also am diagnosed with IBS and that causes multiple problems at once. I have also become lactose intolerant since being ill.
If you've genuinely been experiencing chronic pain and fatigue, ask your doctor about Fibromyalgia and any linking illnesses. Bring it up to them. The sooner you find out the source of your issues, the sooner you can begin to manage your symptoms and earn a better quality of life. That is if you have not been formally diagnosed already. You didn't mention it in your small profile or introductory post here.
My Rheumatologist prescribes me Lyrica, a medicine that combats Fibromyalgia symptoms at the core by calming the firing of nerves. It has worked MIRACLES for my pain, vomiting/abdominal issues, fainting, and more. I recommend having a long talk with your PCP about your symptoms and see if that may be right for you.