HSG test this week, really nervous!

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They're doing an HSG (I think that's what he called it, where they shoot the dye through the uterus and tubes to see if they're clear) in two days and I'm scared. The radiology department says it won't be worse then period cramps and then I see all this stuff saying it's the most horrible pain ever and now I'm freaking out. I have a pretty high pain tolerance, but I also have absolutely horrible menstrual cramps that leave me on the floor crying. Anyone else had this test and what was it like for you?