Justine,
In the beginning my son "tigger" had the exact same symptoms when he got cross contamination-- throwing up and/or explosive diarrhea. Now all that is gone. The handful of times he has had wheat or corn in the last six months there has been no signs of either. He did have constipation after a Dunkin Donut he ate at school a couple of months ago. (Said it didn't have a label on it so he thought it was okay).
Initially we gave up corn, yeast (it was on the IgG) peanuts (IgG again) and sugars and milk (as per the DAN dr.) Our son's IgG did not show milk but the doc thought it was important to add to the avoidance list because he had leaky gut symptoms.
I really believe now that mold was an issue with him. I can't prove it, but the diet we went on kind of eliminated the main mold sources in his food. We did a candida test but it was four months after his diet change and the result was negative, yet he still had reactions when I tried to reintroduce some of those moderate "moldy" allergies 6 and 9 mos later.
It is weird. I can't prove it, but I definitely have my suspicions. I have binged on corn chips, etc... a few times over the last year and every morning after I've had a really puffed up face. I'm just not that into corn anymore.
I can't remember if you did a pyroluria test or not. Most of these kids have low glutathione, and some test positive for pyroluria. It is not on the OAT but if the results show low glutathione, low C, low B6 I would say you may want to look into testing for that next. Our son is doing great on a low maintenance dose of n-acetyl cysteine for glutathione. I skip it on the weekends and give only 1/4 a capsule a day for him along with his diet.
I looked at Rainbow Light Calcium online. I don't recognize anything that would make me suspect it would be a problem as far as other ingredients. Your son could use more magnesium. Most folks like to have a 2:1 ration of Mag to Cal for tics/tourettes.
The yogurt could be a problem. Read the package and see if there is other stuff in there that you suspect-- a lot of time they add cornstarch, pectins, etc.... Some folks use a non-dairy probiotic. Kombocha is supposed to be good for you too. They have that at Whole foods. A woman on another list is making her own with coconut milk. You could easily do that with a yogurt maker. You could add some of the yogurt you have with the bifidus and culture it with your new base-- coconut milk, goat milk, whatever you want to try. You can also buy starter probiotic powders at any healthfood stores. You make it like 'friendship bread'-- remember that? You just make a batch and when it is almost gone you take the last bit out to help you make a new batch.....
We did homemade goat yogurt with our son during the healing phase after the first nine months of GFCF when we felt his gut was healed better. He stayed on that for almost a year. Now we buy regular kefir and he gets it every day w/o problems. So things will get better.
To this day we still avoid yeast. We only allow occasional pizza with it. I think he is better off. I tried the gluten free beer about a 1 1/2 yrs ago and it made me get the WORST headache of all time. So I definitely think there is something up with me, my son, and mycotoxins.
On the bright side, today was his kindy graduation. We were all asked to bring something. The table was laden with cakes, cookies, brownies, etc.... I brought a fruit salad. It was the first to go. :>)
(I also grabbed a few GFCFMF brownies out of my freezer. Tigger was happy. The other two were dying from the temptations.)
Caryn