As you are finding this obsession seems to be out of hand and interfering with your life to a degree, you mind find it beneficial to talk with your Dr about this and what is going on. It may be that a referral to a Therapist for a little while will give you the tools to get these thoughts out of your head and manage them if they ARE there.
Is there something emotional going on which is adding to this 'need' to want to eat? A lot of people find that it goes hand-in-hand.
Below are a couple links which you may find helpful:
www.sparkpeople.com/resource/nutrition_art
icles.asp?id=1703 www.sparkpeople.com/resource/wellness_arti
cles.asp?id=693 Good luck,
Kris