I agree with the PP...eventhough you homeschool you can have your son evaluated through your local school district.
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First of all, yes yes yes! Sensory Processing Disorder (Sensory Dysfunction) Is VERY real and can be dabilitating for children and adults. It's very very important for us to be educated on our specific needs and MEET THEM. Same for our children.
As for the child psych suggestion - DO IT. Look into that and the evaluationt through the school. Neither will harm, possibly will help.
After reading the Explosive Child book, I couldn't get Abigail to a child psych FAST ENOUGH. She was incredibly helpful but after 3 visits we discovered that my sensory kid had been suffering from PINWORMS. She couldn't articulate what was wrong, and of course she doesn't process "itching" or "discomfort" like a regular integrated person so it had escalated OUT OF CONTROL.
OVernight with ONE DOSE of medicine she was a new kid. Now, we still have SPD and regular quirks but each day was no longer panic attacks, screaming, meltdowns and terrifying explosions. The night terrors, nightmares, night waking and bed wetting ceased.