Sympathy for those who have had a bad experience with sigmoidoscopy - I have read about all sorts of different experiences in this forum - but mine was pretty uneventful.
Firstly, I seem to have had a slightly different process than most.
(1) I went through the full bowel cleanse using Picolax and fasting.
I haven't seen anyone else who reports having this for a sig.
I found the discussion about Picolax on the colonoscopy forum and have posted in more detail there.
Although this takes over your life for a couple of days (you can't do a lot when you have to be within sprinting distance of a loo) by the time I went in for my procedure I was completely empty.
I was complimented on how clean my bowel was, and it certainly looked it on the monitor!
(2) I wasn't offered any drugs or gas/air to help relax me or anything.
I was told that because they were only looking at the first (left hand) part of the bowel, and didn't need to go round the big bend at the top then it wasn't necessary. Can't disagree with that.
The procedure was 'interesting' and feeling a tube moving around inside me was wierd, but there was nothing more than minor discomfort, mainly when they pumped in a bit of extra air to look around a turn or into a fold.
I was obviously anxious before the procedure (blood pressure was much higher than usual) but it was all fine. Nothing found, all shiny and clean inside. Blood pressure back down a lot (though not quite back to normal) when I was checked in the recovery area before my cup of coffee and discharge.
So all in all not as bad as I feared and in my case nothing to get worked up about.