HSG, so nervous!

Figured this might be the best group to ask. Who has had a HSG, how bad is it? I Mean sure Ive laboured drug free and delivered via crash caesarean section, but I'm feeling a little nervous. Should I do anything in particular to prepare for it? I'm Aussie btw so not sure if procedure is a little different in other countries but I assume for the most part they are the same?

If my tubes end up being blocked, I'd take a gander that it would be from adhesions from my section (obviously not a DR so can't be certain, if they are blocked could be for any reason) but what do they generally do if your tubes ARE blocked? I've been TTC for 2yrs 9months now :S

Oh and do they give you some sort of pain relief for it or something? I mean i was instructed to arrive half an hour early for it by the receptionist so? Thank you all in advance for your input 😊💜