My RL pal Randy went through the procedure at about the same time you did -- i.e., a few years ago -- and likewise tells me there's nothing to worry about. This the rational part of my brain completely understands. But I'm to medical procedures as some people are to spiders -- at least, to certain kinds of medical procedures: tell me I'm going to be put under so I can be sliced open, and I'm fine; give me an injection or take a simple blood sample, and I'll ask to lie down while it's being done. It's purely psychological and at a purely irrational level.