Thanks for the replies. I've already been to my doctor, it was probably 9 months ago now. He sent me to a specialist, who took one look at my hair and told me I'm not going bald. Then the specialist sent me to get all those blood tests done and the results came back saying there is nothing wrong with me, yet my hair continues to thin out all over my head. It's weird. I've exhausted pretty much all the possibilities and I still don't know what's causing it, and I probably never will, so the next step is to just shave my hair off and get a full cap.