These thoughts and fears are perfectly normal, well normal as far as OCD normal
We must remember that a worried, anxious, tired, run-down, burnt out mind makes mountains out of molehills, canyons out of cracks & TERROR out of harmless (harmless because it's just a thought - it's the worry about a thought that wreaks havoc afterwards) thoughts.
Here's a couple of links that I've just pasted into another post:http://www.anxietyzone.com/index.php/topic,53901.0.htmlhttp://www.anxietyzone.com/index.php/topic,75429.msg428734.html#msg428734
What I hope you will notice is the similarity between the initial thought and the terrorising (by the mind) that follows afterwards. You see it doesn't really matter what the thought is, the thought can be anything, anything that raises the pulse, gets you hooked, pulls you in, induces fear/loathing, etc., etc. - what matters is that it has GOT YOU ATTRACTED TO IT. Once you are attracted to it, disgusted/dismayed/upset/overwhelmed, etc. (all this types of feelings are still an attraction) then it has you in its grip, it has your attention and there is a mental LAW that says ANYTHING WE GIVE OUR ATTENTION TO EXPANDS.
So you are feeding this fear, this worry, by thinking about it!!.
"YES" I hear you say "But I can't stop thinking about it!!". "But you can" says I, because just by knowing it is only a thought and, if left alone, it can't harm you, you will begin to realise that you must start to leave it alone.
Now leaving it alone is hard at first, but the more you SEE that when you don't think about it, it can't bother you AT ALL and the more you SEE that when you think about it, the more it upsets you - then the more you will realise that this thought is useless to you and WHEN that happens (and ONLY when that happens) then the less you will become OBSSESED by it.