The same thing happens to me but only once in awhile. I don't think I have IBS because I eat the same things, it's the time of the day that messes with me. I first happened after a night of drinking wine, eating cheese crackers, I can't remember if I had sausage on the crackers. The next morning I woke up fine, with only a slight feeling of needing to use the bathroom. Once I did go in and sat down that's when I had all those feelings you had. Extreme sweating all over, cramping, weakness, I was trying to play a game on my phone to distract me but I could not. That was 1 1/2 years ago. The next time was a couple weeks but I eat some pork, and beef ribs about an hour or 2 before bed. The next morning, the same thing. A couple days ago, I was constipated and it was a little irritating so I thought I flush it out. Again the next morning the same things. I don't Know what I have but the pain and the feeling is something I wouldn't wish on anyone.