I'm sorry to hear about your son.
I'm sure you are having a bad time of it right now and it seems like life can be so unkind at times. But, like others have said, it does get easier over time and although you may feel that you have a mountain to climb, you will get there.
My children were diagnosed within a day of each other. I was in shock for the first week or two and went through all the usual emotions like anger, sadness and why us? But now, life is pretty normal just in a different way. Sometimes I get a bit fed up with the whole thing, but I can see that my children lead a care free life (which is all that matters) and they just get on with it.
I'm sure that you will find this forum very helpful. There are lots of parents including myself who normally log in at least once a day, so you should find that any questions you have are answered swiftly.