Excessive painful gas, cramps, constipation but with sudden urgent need to have bm, nauseau especially in morning, chronic low abdomen pain- IBS?

Maybe, but... ...IBS (Irritable Bowel Syndrome) is a diagnosis of exclusion. To accurately diagnosis & treat IBS, your doctor must exclude infection (like small intestinal bacterial overgrowth), inflammation (like Crohn's), structural pathology (like partial obstructions), dysmotilities (chronic idiopathic constipation), metabolic problems (diabetes, low thyroid), & extrinsic processes (bladder, female organs).