It sounds like you’re right. There are a lot of things going into that product and if your body has adapted to the overgrowth over the last few years, the body may have acclimated enough to it that this product (and the diet) may be upsetting that “balance”, which is giving you the symptoms and those should pass within a few days after they started (meaning they should end any time now). If it lasts for more than a week, it’s very possibly an allergic reaction to one of the nutrients in the product. It’s also possible that you just happened to catch the flu shortly after you started taking this product.
Without being able to run tests to find out why you’re sick, it’s hard to say which it is.

What I can suggest is to keep taking it the same way you’ve been taking it until you’ve hit about the 8th day. If you don’t feel better by then, I’d suggest to stop taking it. Once the flu-like symptoms have been gone for a week or so, you could try taking the product again to see if it was an illness or if it was an allergy.

From the listing of the ingredients, it sounds like a really good formula to fight yeast and help replenish the good bacteria in your intestinal tract so your body can defend against further yeast problems, so if you’re not allergic to it, it would be a good formula. Good luck!

You might do better to ask the manufacturer of the product.