Son recently diagnosed with ASD, where do i start?

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My son is 22 months, has reggresive ASD, he's been on GfCF for a month,

b12 shots, asd plex supplements, zinc and selenium supplements, fish

oil, and d lactate free probiotics as well. i was thinking of starting

enzymes, but do not know which to use, and ideas? Doctor told me to use

diflucan for 2weeks but i've heard of the side effects, so I stopped

after 3 days. Can anyone give me any advice on what's really worked for

them.