i can get this as u prolly know already i think obviously if really worried ask a professional. but at a guess i would say its all those months of no af coming out, if u start to feel very lethargic tired ask a proffesional. Also keep your fluid intake up and water and rest as much as possible as hard as it is and have some iron ... tuna is good and red meat i always eat tuna during my af.

If this is not normal for you i would ask for advice. like 13 health?