I agree. You do need help. It sounds like you're starving yourself. Unless you have some physiological reason for not being hungry, like the stomach flu, this extremely minimal calorie intake qualifies as anorexia, and if you have psychological or compulsive reasons for eating so little, you most likely have anorexia nervosa. (Disclaimer: I'm not a doctor so you'd need to get a pro to make an accurate diagnosis.) I have bulimia, so I understand the fear of gaining weight, which is the mask we with eating disorders use to cover our emotional pain.
You're not alone. Please get help. It's out there. Maybe just a phone call or e-mail away.