Odd occurrence

yesterday, my stomache was not feeling very well.  I went to the bathroom feeling like I may have some diarrhea.  While I was trying to go, I was hit with this incredible abdominal pain.  It felt like a contraction during pregnancy.  they were a 10 out of 10 on the pain scale.  I started to feel very faint.  My vision started to turn white.  My arms felt like they weighed a ton.  My ears didn't ring but instead had a scratching sound like when a record is done playing.  I had to lay on the floor of my bathroom for quite a while until I felt better.  I have had this happen before but not very often, like once or twice a year.  I have no idea what it is.  I am healthy, not on any medication, and not pregnant .  Any ideas?