Hi birdpumpkin, sounds like you're feeling a lot of pressure. But about your son, well any blame coming your way for not working with him on reading, spelling etc ignore it!!!
It's so good that you were working with him in the first place, when you could. I'm sure there are a lot of parents who couldn't, so real kudos to you for that.
And if you don't have the strength right now to deal with it, well you're already having to cope with so much in your life/with the way you're feeling. Remember you need help as well as him, and when you're feeling a bit better.............
But when you're ready, yes, there is the internet which might be able to help and for when you're ready, I don't know whether some of these links might be of any help (some printable things on some of them):

http://www.do2learn.com/
Kindergarten Worksheets and Preschool Worksheets - School Sparks
Aven's Corner - Preschool Online Games and Educational Online Games

Autism Information and Learning Tools on Pinterest
TeachersFirst's Resources on Autism Spectrum Disorders and Asperger's

But perhaps your husband can help too????

I'm guessing you might feel a little isolated in caring for your son as well?? So could you catch up with any parents of children in his class/with similar difficulties e.g. for a cup of tea/coffee and a chat?? Might help sharing experiences/talking??

And really good on you for trying to keep up with your interests. I know it can't be easy, but like we said........a bit more focus on you (and your needs).

Alison