Of course this is not unusual. I am sorry you are going through it, but it is very early days yet and tbh you may not be able to beat it at first. Maybe one strategy is to "allow" yourself to experience the distress ... try to roll with it a bit ... after all it is enormous news and shakes a lot of your foundations about how you live, massive uncertainty looms and you cannot expect to absorb that all at once
I can only say you do
get used to it, but even then I would also
say that it had never left my thoughts! Something stressy about cancer tends to pop in first thing every morning ... wherever I am or whatever I am doing .. but it no longer takes over and even with new diagnosis, different treatment plans etc over the years I have found I can adapt to them quicker now ..
We recently had a thread about tips to beat insomnia, perhaps you'd like to look here:http://www.beatingbowelcancer.org/forum/index.php/topic,1731.0.html