What Causes Dizziness While Bending Down?

I am a 28 years old female,my height is 1.6 i got no medical history.4 a couple of days now i have been suffering dizzines and everytime when i bend down then my head spins and i get the burn in my nose.last nite i was bending down again and as i bend down i felt the warmness that came over my head and suddenly i stood up and my eyes was started 2 get so red and my whole body started getting warm and i could not control my body and after a while the redness in my eyes went away,but i still don't feel right and my stomach keeps on working and getting the abdominal pains.can u plz tell me whats wrong and what i must do and why did my eyes turn so red.Chantal