Stop in for a cup of coffee

Actually I have not drank dew in a long time joking aside.

But I am a little worried because the other day at work, I ran up some stairs because I hate elevators. When i got to the top I felt very light headed and a friend said I got really pale and he sat me down on ground because he thought I was going pass out and fall.

That was kinda scary, I have a doc appointment tomorrow
Dehydration ?