My son will be 3 next month and has severe apraxia, and I also suspect he may fall somewhere on the high functioning end of the autistic spectrum. His immune system is dysfunctional, causing him to react on some level to almost every food product in existence (or maybe it just seems that way to me!) He gets diarrhea, cranky and very spaced out when he eats forbidden foods. His immune dysfunction is the root cause of all his problems.
Anyway, I really suggest you check out the apraxia-kids.org
website and get on their listserve. There are a lot of great articles on there by professionals, covering how to diagnose apraxia, treat it, etc. It has been SO helpful to us, esp. in gettin my son the proper therapy. Jacoab is finally able to say some simple 2-syllable words (he even said blueberry the other day, boo-beh-ee!) and put some words together after a year of 2x week speech therapy.
Also, feel free to PM me with any questions or just to vent. Apraxia and ASD have been the bulk of my life for the last year! It's such a scary and lonely thing when your baby has problems.
Best wishes, Becky