I've had two of these. They're not as bad as you may think. Indeed, the worse thing is the 'cleaning out' process you have to do the day before. And that's not too terrible, either, nowadays. Picolax has gone out of use, the ones they give you are far less 'explosive'. I'm guessing that's what the Creamolax is for.
The staff who are around these things are fully aware of the total lack of dignity that the procedure imposes. In my case, they've given me underpants with a hole in the back to wear. And they really treat you like a grown-up. They'll explain just what's going on all the time. Indeed, if you ask them, they'll let you watch the screen they're looking at! I did and it's fascinating.
You'll be given some relaxing drugs. They make it so easy and you won't remember much about it afterwards. However, they won't let you go home until quite a while after the procedure. I'd take a book if I were you. And I had to sign a disclaimer when I wanted to leave without somebody with me. They like you to have a minder, as it were.
Above all, any problem in that area is best treated as early as possible, so it's well worth having it done.
Good luck to you.