T.J.
I might not be much help, but your child's symptoms sound like a lesser version of what my friend's daughter had when she was diagnosed with kawasaki's. She completely stopped crawling and fell baclward developmentally, and eventually caught up and is now a healthy four year old. She still goes in for tests once a year, I don't know if she's on any medications still but is doing great. Her mom was a medical assistant so I'm sure they just followed everything the doctor said and now she's doing fine. Do some online research and get a second opinion, stay strong! :)