Cheers mate that helps a great deal. I think what I cant get into my head is why I am not so elated that no one was killed or seriously injured.....I obviously am but it does not feel like it.....I dont suppose it helps to know that my mom who has a history of heart problems for years is a lot worse than she makes out and to be honest I get so angry with cold callers as everytime the phone goes I fear the worst.I am not sure if it was you that was in the accident or your son, ukr, but either way it sounds a bit like delayed shock or mild post traumatic stress syndrome. Being part of a traumatic incident, or even just a near miss, can really shake you up sometimes.
I have been in an earthquake and was once sat in a pub when all the windows came through thanks to an IRA bomb. Neither of those bothered me, but when I had some heart arrhythmia issues a few years ago it triggered an ongoing spell of huge anxiety and panic attacks. Sometimes there is no rhyme or reason to why an event triggers these feelings. The only thing I will say is that it's temporary and you will gradually start to feel better.
When we feel down we start to see the negative in everything. It's called cognitive errors. We don't see things as they are, we see it all through the filter of negativity. In reality, the world is pretty much the same as it was a few months ago, so what has changed? The way you are viewing it has changed because you have had a bit of a shock. It will pass, just try to relax and don't be too hard on yourself. Best wishes.
https://www.psychologytoday.com/blog/in-practice/201301/50-common-cognitive-distortions