I Feel Very Dizzy After Cleaning my Nose from Rhinoplasty?

I had my my rhinoplasty surgery 2 weeks ago. Today I was cleaning out the blood crust left inside my nose. I did not go deep inside my nose, just a little bit in and pulled out the blood crusts. I did not get any bleeding or anything. I just felt dizzy and had a bit of a headache. I cleaned using an cotton buds. Why did this happen?