Important health question.?

[karen]

Last night me and my husband went out to eat at Red Lobster. I'm currently pregnant with my second child im 3 months so far. I been still have morning sickness. Last night after we ate I wasn't feeling sick or anything I was fine, anyways we got in the train and we where both standing up. 15 min in to the train ride I started to feel real dizzy, my vision went blurry and yellow my chest got tight and it was hard to breath, and also my hearing got very distant. Me and my husband got off the train and we sat down on the bench. As soon as we sat down i vomit and i went back to normal like nothing happen, and another thing I'm always thirsty. I made a doctor's appoiment which is not 'till Friday. Does anybody have any opinions of what could this be because I don't think is normal I don't think it has anything to do with pregnancy. My mom says it could be diabetes I was also thinking could I been allergic to something I ate the see food? but at the same time I ate this before so many times and nothing ever happen. Thanks in advance.