I passed out at work yesterday?!

I passed out at work yesterday?

I was at work and feeling good all day, then we were having a meeting..standing the whole time. All of a sudden I passed out and hit the floor. My co-workers said I was shaking for a couple seconds. Luckily I didn't hit my head, instead I smacked my cheekbone on the lynolium..didn't hurt any less. So thats swollen up, my head aches and my neck is stiff.

At the hospital...they said I was severely dehydrated and my blood sugar was high. I am not diabetic or ever had any symptoms before yesterday. Never been in the hospital ever! I'm 26 female...5'8" 149lbs recently lost 80lbs. I eat healthy and excercise. I do drink a lot of water and fluids all the time. I don't even eat sugary foods like chocolates. They said I was doing everything right with my diet. I don't understand how I could have both those dyagnosis.

Can someone give me any opinions, experience, suggestions as to what might have caused this episode?
I'm going for a follow up, but just want to hear others comments. TY!

You are sufferingfrom ether sugar withdrawl or you were not drnking enough it also could be drinking to much