Hello, I'm 20 years old, and have a fairly healthy life, I don't smoke or drink at all. I am a little overwheight but Recently in the past 5 months i ve lost at least 20 pounds. About 2 months ago I started having bad headaches, and my hair started falling out. Also I have these weird pains where the leg joins with the hip when I sit on the ground for too long. I also have pains sometimes in my ears and today I felt this pain for a few seconds in the right side of my neck where my hair starts. That got me scared, what do you think could be wrong?