Severe Cramping & Numbness in Extremities During Enema

(I'm sorry if this message is really graphic.) I'm a female in my early 30s, no health problems, and I did a 24 hour fast yesterday, and last night I did a water enema. I have been doing enemas off and on for years because I often get constipated. Anyhooo...I did the enema using warm water and using the full enema bag, then after draining the bag I laid down in different positions massaging my stomach to disperse the water inside the colon as I always do. After a few minutes, when I sat down on the toilet to expel, a lot of water and feces came out, but then I started to get severely painful cramping...I was doubled over in pain on the toilet...and then my feet and hands started tingling and going numb...my face broke out in a cold sweat...and I felt like I was going to faint, which I've never done before. I reached over and turned the water faucet on and splashed some cold water on my face and then, mercifully, I expelled some more feces and water and I started to feel better. The numbness, cramping, and EXTREME discomfort slowly subsided. I honestly thought I was going to lose consciousness and die.

I have had cramping during enemas before, but never this severe and never accompanied by severe tingling and numbness in my hands & legs. It was really awful. Does anyone know why this happened? I am so afraid to ever do an enema again. Thank you!