I understand your feelings Maebelle.
All through our autistic children's growing needs and years there can be a rollercoaster of emotions, ranging from elation to severe frustration.
I hope you can all use this latest experience to strengthen your resolve, again, to find a solution, provide and assist your son with everything he needs and wants to have a fulfilled life.
I aim to teach my son all I can, with the assistance of others where necessary and where I can source it, to live as independent life as possible, though with the acceptance of the fact that he may and can live with me forever.
Not all avenues of 'assistance' out there will be what you either expect, hope for or they may even let you down, as you are feeling now.
Hang in there. Keep searching for what is the best eg., help, educational, voctional etc. area for your son and I feel you will find it. There is usually always the right solution/situation available to us all, though it can feel like a long and daunting energy and spirit sapping task to find it.
Where one 'avenue' lets you down, there is another which can be the one you wished you'd discovered earlier.
We have to work hard as parents and carers sometimes to ensure we do and get what we know is best for our children. We also have to sometimes endure (as can do our children) the 'gutting' frustrations in that lifes' journey.
Trust your instincts and don't place ALL your faith in the 'abilities' and promises of others.
Be your sons' best advocate. I'm sure you will find the best results and situation you seek soon.
I wish you well.