HI Shades,
Sorry you had such a bad experience with IUI. I would defnitely talk to your FS about it as I would not think this is "typical".
I've had 6 x OI/IUI cycles and not once did I feel anything other than mild discomfort during the IUI.
A few hrs later i would usually get fairly significant ovulation pain but not from the IUI itself
Any chance the pain might have been O pain?
Hope you don't have to go through that to many times !