I have a friend with an HG+ child who is now 16. She still kicks herself over his horrible, painful, awful early elementary school years...8-10 years earlier.

So, yes, what you're feeling is a perfectly normal part of the process. It's like the stages of grief, and it follows a predictable pattern. That's both good news and bad news for you, I guess...
My best advice is to acknowledge that your guilt simply means that you are a good mom who loves her child. Then forgive yourself for not being perfect and do the best you can from where you are now. Guilt is a wasted emotion! It doesn't help you or your child, and it's part of that same perfectionism that you are seeing in your child and your younger self.
Even though it's normal to feel guilty, your best move is to let it go as quickly as you can. Move on to the last stages: acceptance and taking action.
Hang in there!
