Unbearable

It seems like every other week I have one day where I get unbearably sick and have diarrhea cramps so bad I’m on the floor crying. I’m 34+2 weeks and it’s happening AGAIN today. Every time I get up from the toilet the stomach cramps start all over again and it’s so frustrating. I end up spending 45minutes to an hour on the toilet multiple times a day! What is this??? Why is this??? It hurts so bad I just want it to stop!