I was thinking about you last night, Wiggly - and I realised that I missed a bit off that last post.
I really do understand how difficult it is to let go of the anxious thoughts - I have had some doozies in my time - but what I learned in therapy is that it is a matter of practice.
For example, whenever you find the anxious thoughts about the asbestos fibres creeping in, you need to stop and remember some of the things that have been said on here - consciously think 'Think how careful he will have been, not to contaminate himself and risk his own health or other people's health. This means there is no risk to my baby'.
Basically practice replacing the anxious thought with a reassuring one - it will not work straight away, it's not a magic wand, but if you carry on making yourself look at the positive, whenever the negative thought comes up, gradually you will get better and better at it.
I struggle with self esteem, and one of my big anxieties is that no-one really likes me - why should they? I am overweight, not particularly interesting, didn't do well in my career - why would anyone want to be my friend??! I am practicing replacing that thought with 'Look at all the friends you have. Look at how pleased people were to see you this morning, at knitting group, and how they have been concerned at your absence. Does that sound like they can't stand you? No, of course it doesn't!!' It's not easy - the self-loathing is very deeply ingrained - but I am winning, I hope.
I would encourage you to get some help with your anxieties - I had 2.5 years of group therapy and then several months of cognitive behavioural therapy, and they really helped me. The CBT was particularly useful to me, and has helped me a lot.
I do have a book, called CBT for Dummies, and if you would like it, and don't mind me knowing your address, I will happily send it to you. You have a lovely baby, and you deserve to be enjoying your life, not worrying about things. 