I know exactly how you are feeling. My son was diagnosed with sensory integration disorder - which is not the same as autism, but a LOT of autistic kids have sensory integration disorder.
I rarely saw any of his "problems" at home. It was only when I was in strange places with him that he became uncomfortable and I could see that he was just "off". I kept telling the pediatrician that something was "off". He even had two early intervention assessments that said he was fine. But, fortunately for me, he was speech delayed and he started receiving speech therapy at a full therapy location. The therapist noticed that something was "off" with him as well and she asked me if I wanted an occupational therapy evaluation. I immediately said yes I did. I had to pay full price for it (because it wasn't referred through my doctor), but it was worth it. They are the ones that diagnosed him and he started getting therapy.
BUT, I was mortified to tell the school that we had a name for what was wrong with him. I thought he was going to be labeled and then stuck in a corner and not dealt with. However, I had just the opposite experience. BECAUSE he was labeled, he started getting special treatments that enabled him to actually have GOOD days at school.
So, forget what anyone thinks and buy into the assessment and the action plan. FIGHT for your child's rights. YOU will be happier than you have ever been in your life. And, if you are anything like me, you will cry at those small steps that you child is now allowed to make.
To this day, my parents don't believe anything was wrong with him. But, I KNOW the therapy he received made a HUGE difference in his life. I am telling you this because even if your husband is resistant to the diagnosis, follow your gut and GO with the treatment plan.
Also, I recommend the book "House Rules" by Jodi Picoult. It is a fiction book, but it really opened my eyes to autistic children and the resources available to them. This book was not based in Texas, but I think once your eyes are opened to possibilities, it makes it easier to search them out.
Good luck,
L.