Frequently, since childhood, when i have a bowel movement i get hot, bad cramps, nauseous, & sometimes vomit. i get diarrhea also. please help. ?

IBS: 30's fem w. abdominal "cramps" & defecation-associated "nausea, vomit & diarrhea since childhood" likely w. Irritable Bowel Syndrome, IBS; autonomic-mediated functional disorder found in women w. Hypermobility Syndrome, HS. I have noted sacroiliac joint subluxation, & hypothesized impingement of contiguous presacral plexus parasympathetic nerves, PN's, in females w. HS. PN's mediate defecation.