Lower back pain bloating fatigue feels like ther is a brick in my pelvis sometimes and very gassy. the back pain has gotten worse over several months.

Ans: Sounds like you need to see your doctor. You sound like you may be constipated but you need to give a good history to be able to diagnose and treat you. See your doctor for a full history and exam

Many possibilities: Assuming you have been otherwise healthy and no significant family history I would start with running some simple blood tests and updating a routine pelvic exam and pap. I would likely order a CT scan of your pelvis as well. You do need to see your doctor for a formal eval. It is not likely to be serious but there is a rather long list of possibilities.