I was diagnose 2yrs. ago with gluten intolerance through entero labs. My 10 year old son seems fine, but it seems that at least once a month(lately) he has diareaha or vomiting which usually lasts only a few hours to half a day. He eats gluten lite at my house, but gets a lot at his dads. I also have noticed that the last 2 incidents have occured after eating pizza and ice cream (happened 2x in a week). The pizza at my house was gluten free. I am wondering if this could be lactose intolerance. Can this cause vomiting? I thought lactose only caused constipation or diareaha. Can gluten intolerance symptoms come and go? It seems that some of these incidents happen after dairy, and some after gluten. Once it happened after my mom bought him a big cinamon roll. Sometimes it happens within an hour and other time a half day later. What do you think. I am also mildly lactose intolerant and so is my mom. Most of the time though he eats and is fine. Weird.

Anyone??

My daughter had intermittent symptoms of pain from gluten for months, maybe years, until she started having it all the time. It took six weeks for the pain to go away completely after stopping gluten. The intermittent nature of your son's digestive problems could be the start of it if my daughter's experience is typical.
she was also lactose intolerant by the time she was diagnosed with gluten intolerance. She now is able to eat a bit of dairy for the first time in months without appreciable problems.

Does anyone else have advice??

Symptoms can definitely be intermittent and change in response time for both gluten and lactose. Sometimes lactose gives me severe stomach pain, sometimes nothing. I have never vomited from it, but I wouldn't be surprised if some people do.

I'd suggest getting him tested for gluten and lactose or doing an elimination diet. Testing might be the way to go if you will have to convince his father it's necessary.