26week pregnant never happened before?

I eat my breakfast each morning at 10am, at work, i get 2% milk water with lemon and a bowl of raisen bran.. well just went down to grab lunch, actually an hour early, and as I was standing in line i got this feeling like i was going to p out not dizzy but my legs went numb feeling, weak in the knees, my eyes rolled back, I caught myself but now i am shaking and weak... i feel like my blood sugar just hit the floor, why would this happen? I didnt have any feelings preceeding.. nothing...