Intense intestinal cramping and multiple times going to the bathroom

I have intense intestinal cramping that lasts for a few hours alongg with constantly having bowel movements ( 5-8 times, even 15 minutes approximately). My blood works excellent.. I had a colonoscopy 3 years ago with no bad results. I was diagnosed with celiac 15 years ago but have it well under control with my diet. My GP said I have irritable bowel and prescribed an anti spasmodic 4 times a day, Dicyclomine 10 mg., which I haven't started taking as I have an adverse stomach/intestinal reaction topmost drugs. I cannot eat spicy food or eat a lot of food at the same time.I must wake up two hours early for any early morning appt. just to be sure I do not need to run to the bathroom. Have tried regulating my diet and taking benefiter which my last gastro doctor recommended. Any recommendations or insights are gladly appreciated. Please help.
p.s. The pain was so severe two weeks ago, I almost went to the ER. Everyone in my family has diverticulosis
and 30 years ago I was diagnosed with this also.