Would it help to sit down with your doc. ahead of time and express your concerns? Don't be afraid to talk about them, and ask questions as you are going through it. If you are really anxious, a little anti-anxiety med. would not hurt. Cath. done right does not hurt. And, usually, as noted above, what we fear is not what is---and, even if it is the "worst", there are still treatments, things to be done, a life to be lived. Take care. & let us know how it turns out.