I don't usually reply to #12345 screen numbers anymore, but I'm a grandparent of 2 fully recovered, formerly severely autistic grandsons.
Since we've spent several hundred thousand dollars and 10 years (and counting) discovering the methods to autistic recovery, we've also helped several dozen other families start the road to recovery for their autistic kids.
It's not expensive once you know what to do, but it's VERY expensive when you're in the "try everything and pray" mode, and your results will be necessarily limited, due MAINLY to the "professional" commmunity that takes your money, and guides you (mostly) in the wrong directions.
That said, a coupla things..... The "parasites" are the least of your problems and you really need to get rolling on recovering as much of your son as possible. The candida and leaky gut are ALSO just symptoms, and the longer he's non-verbal, the more likely he never will be verbal. Plus you have (as you've probably noticed) the problems of hormones kicking in and as his body develops, you have doorways closing to functions he'll never be able to recover.
You need to give more detail about your son...Was he autistic from birth, regressive after 18 months, is on gfcf/sf/cf diet, does he make eye contact and does have dental fillings and did YOU have dental problems that had been filled with Amalgam mercury before he born? Has he been vaccinated over the years, and what were they? (including the Hep-B at birth) Have you done any heavy metal chelation and does he have any problems with hearing or eyesight? (or can you tell?) Does he have violent tendencies, or can you control him pretty well?
I don't mean to get your hopes up for nothing, but I've seen some spectacular turn-arounds, and if you can get him talking, your lives will change dramatically. (it's generally not too hard to do this, btw)
Let me know if you'd like advice, but not if you're going to have me type it all out, just to ignore it because there's so many conflicting opinions coming at you.
I don't mind helping if I can, but it'll require discipline on your part and the willingness NOT TO TRY EVERYTHING AT ONCE. You can't make progress unless you follow a METHODICAL process of trial and error towards his problems.
His gut chemistry sounds fairly screwed up and the Miracle-Mineral-Supplement drops will help him later, if he can't tolerate it now. But we're talking about a recovery process of YEARS, not MONTHS or days, and if you start a reasonable program of recovery today, you'll probably see measurable IQ and verbal differences within a year.
Our kids are not "tough nuts" when we spend enough of our own time DIRECTLY OBSERVING THEM, and we become their own personal "autism experts" with a little simple and inexpensive guidance of what to try next.
(Just in case you're wondering, I have nothing to sell and have a real job in an unrelated field, not one that bleeds hurting parents dry when they're at their most vulnerable.)