You have low iron, which small exertions can cause shortness of breath and fainting spells.

Zane is a doctor and would always freak out if he sees you unconscious he cares about your health so much.

one day you woke up having an extreme headache and feeling weak you felt really lightheaded but didn't wanna disturb Zane who as sleeping beside you

you got up to use the bathroom but just then you started to feel dizzy and knew you were about to pass out soon