I never had a problem that I was aware of with digesting milk or store bought kefir, but I used to believe I had candida overgrowth, but after years of trying to 'fight' it, now I'm not so sure I even had it. So confusing!
I think a lot of the problem is that there are so many sites out there listing diseases and symptoms they are attributing to Candida that have absolutely nothing to do with Candida. So people read these bogus lists and find enough symptoms that fit what they have that they assume they must have Candida. The same applies to sites listing a lot of the same symptoms for mercury from amalgams, parasites, etc. This is why I say people need to be SO CAREFUL with self diagnosis.