Laughalot, I am a bit like that with my ds, who is 4.6(he doesn't start school until August, we live in Scotland) but I do, rightly or wrongly feel responsible for the way he is .
I did have some quite invasive treatment when I was pg with him (and was very stressed about it), which I wish I hadn't agreed to now. When he was born he had the cord around his neck, I wonder sometimes about that... then he had febrile convulsions up until he was nearly 18 months old.. and we moved house and became quite socially isolated from friends and relatives for a while.
I also feel like I have been in denial about his problems and how different he is from the other children at nursery.. the bitter sweet experience of the nursery Christmas play really brought home to be that my child has SN and always will and I need to come to terms with that.
The thing is, even though I have been in denial, my ds has had lots of support and input from all the concerned professionals, who I think have been waiting for dh and I to come to terms with our ds's issues... I am glad I have been open to their help, it has made my ds's time at nursery much less stressful.
IF you are ready to look for help for your ds I wouldn't wait, as others have said waiting times for an appointment can easily be 6 months.
Good luck.