Yes I believe you are totally normal.
I am 31 and have had the same symptoms as yourself since i first got AF.
One month I be totally fine, and then the next it will be the worst pain ever.

When the cramps are the worst, I throw up, have the shakes, and once the cramps stop i am totally exhausted
I went onto the pill, and it helped with the symptoms, even though sometimes I would still get cramps, but nothing as bad as when I was off the pill.
The feeling of wanting to go to the bathroom, I have found over the years, that squatting help and if I can I try to avoid using tampons on the day of cramping. Another tip is when the cramping is bad I find that laying on my back with my legs up in a 90 degree angle on a wall works wonders
Hope I have helped you a little.
Dani