What does it mean that im very thirsty, i shed like crazy and i get random head aches.?

Recently i have been more thirsty and ive been shedding hair from my head like crazy. Every time i touch my hair i come away with lots of hair in my hand. I also get headaches more often but the don't last long. Is this just normal for me, or could i have a disease. My menstrual cycle is also irregular which isn't uncommon ut im still worried if i have something wrong with me ...