I Am 28 Weeks Pregnant And This Is The 2nd

I am 28 weeks pregnant and this is the 2nd time this week I have had these nasty sulfur eggy burps, diarrhea, bloating, and unbearable stomach pains and usually I will vomit a few times and yet as I am typing this my stomach is growling. I am severely lactose intolerant and so I stay away from all dairy please help me get relief and find out the cause of this!