I feel like my colonoscopy prep isn't doing anything?

I drank something called Pico-Salax this morning at 11 am. Then at 1 pm I took 4 Dulcolax pills, and 4 more at 3 pm. I have one more sachet of the Pico-Salax to drink. It’s 4 pm and I’ve only gone to the bathroom a few times, very little each time. I have severe abdominal cramps and I feel nauseous and gassy. Is it not working? I thought I’d be glued to my toilet all day. I’m afraid I won’t be cleaned out enough.