I dealt with this for a long time back in 2008 and I feel your pain, it is one of the worst things imaginable. I tried taurine and I tried drinking aloe which is supposed to help but it did nothing. It got so bad that I couldn't sit up in bed or my abs would cramp up, I had to just roll out each morning. And anything that caused my body to tense up in that area, you know, like sexy time, would result in cramps...nothing like lying there with your girl and being near tears because of the pain...one time the cramps got so bad it actually made me throw up, at that point I went to the doctor.
Two things, my blood work showed I had very low sodium, I wasn't purposely trying to keep my sodium low but I wasn't getting enough. When everything you eat is fresh and if you add little salt this tends to happen. Also, I wasn't getting enough fiber in my diet, I had been on a keto diet for a time when this first started and had forgone fiber supplements...huge mistake.
Advice, fiber and salt. If your problem is the same as mine this should take care of it. If not, something else is going on and you need to go to the Dr. BTW, even after I added the salt and fiber it took a few wks for everything to work right again...it didn't fix itself right away.