I think that what you are describing is Tricophagia, when you eat your hair that you pull. And unfortunately there are some negative cumulative effects of doing this, like hair balls (trichobezoar) that form in the stomach and bowel because we cant digest human hair. Studies I have read on this usually require the person to have surgery to remove the mass of hair. However, this is a
rare complication. If you want more information, try searching for Rapunzel's Syndrome or trichobezoar in humans.
The following link has a case study of a young girl who ate her hair as well and has some interesting information.
http://ajp.psychiatryonline.org/cgi/con ... /162/2/242
I think the important thing to know is that there are lots of other people out there who go through this same thing, and its important to seek help in those you trust.