It almost sounds like a panic attack. I have IBS, and in my 20's also had panic disorder. A lot of the time the 2 would link about 45-60 minutes after I ate. I would get a racing heart, sweating, dizziness, cramping and diarrhea. This would happen especially if I was eating out or if I was under stress. Eventually the stress became the anticipation of the attack, sealing my fate.
It's a unit of weight, usually used in the U.K.
Like pounds (lbs) in North America.
You can use a formula to convert stone into pounds.