OK I'm very worried because my mother has this thing that happens to her once in a while. So she can be OK and then she starts sweating cold, feeling dizzy, and then passes out; then she throws up and feels perfect again. WHat can be wrong with her? She has gone to the doctor and they say she's in great condition but obviously that's not normal. She is 41 years old almost 42. This happened to her yesterday, it hadn't happen in like 5 months. I get that sometimes too only I don't throw up. Please help! Thanks