HI 1wish, I'm sorry you're having problems. My experience of an HSG wasn't that brilliant I'm afraid. It was offered to me as part of routine tests to establish any causes of infertility (BTW I'd already had an internal scan to rule out PCOS, no reason, they just wanted to rule it out, again I guess it's down to the old postcode lottery!)
When I had my HSG there were 5 of us waiting, I was number 4. I was a bit nervous, but reassured when the first girl came out and said to the rest of us waiting "oh it's not so bad". Cue visible sigh of relief!!! The others went in and out in minutes. Then it came to my turn, initially it's not too bad, a bit like a smear, they put in a speculum and a canular (?) to introduce the dye (which is clear, don't know why I thought it would be a funny colour!)
I had taken some paracetomol beforehand, but the pain I had when they injected the dye was terrible. It took them about four goes to do one tube, I was in so much pain I yelled the place down (I felt awful for the poor girl waiting outside for her go!) They asked me if I'd rather do the other side another time as I was in so much pain, but I thought sod it, i'm here now, so gritted my teeth. That side was just as bad. I was so tearful, the nurses were really sweet, but they said it could indicated a blockage. I was really shaky and tearful afterwards, but no real pain, just a very slight af pain (and this from the chief wimp!) I felt sick every time I thought about the pain. I was terrified when I rang up the doctor for the results but they were totally normal, no blockages!!!!
When I asked the doc why I had been in so much pain, she said that some people do feel it more than others, sometimes your tubes spasm as the dye is being injected, and if you haven't had children, you uterus isn't used to be stretched like that.
I'm sorry if this scares you, I wish I'd been a bit more prepared for it, I was so shocked by how much it hurt. But nothing was worse than the horrendous fortnight waiting for the results, convinced I'd have a blocked tube. The most important thing to remember is if it hurts, it really doesn't mean anything bad, so try not to worry.
One good thing is that sometimes people can conceive very quickly afterwards, the nurse who was holding my hand the whole time leaned over and said "it's just like descaling your kettle, I bet you get pregnant really quickly!" Three months later I was.
I hope it all goes well, I'm sure you'll be much braver than me! xx