I ate pizza yesterday and got heart burn but then ended up throwing up, it happened one time before so I thought it was just really bad heart burn. But this time my actual stomach was upset and I feel achey and slightly crampy throughout my stomach, sides, and lower back then all day I ve felt weak, on top of all that I had hot flashes last night and chills at the same time. Then now tonight I started getting the same feelings but now I have diarrhea. I m 7months pregnant, what might be the problem?