No Milky

We have discovered that my husband can no longer tolerate milk. He was a milk-o-holic for years, two gallons a week. But we put him on Silk almond milk for weeks then he tried some milk, bam, back to pain and nausea. Back to Silk and he is fine again. We replaced his half and half and probably will remove cheese as well. But for now Silk and coconut milks make him happy. The cause? We are not sure, could have been from a tick bite but no one knows. I can have milk but for him it is a big no. His gall bladder attack feelings have stopped as well. The doctor and all the test have told us nothing. But for now his is on the mend.