Forget about seeing a doctor! A doctor is trained to get you hooked on a drug that you will need to take for the rest of your life. Don't even go there. Doctor's are relatively good for knowing a skill - say for instance stitching a wound or treating a broken bone, but for matters like this you've got to help yourself or you'll just end up worse off.

Now. Let's think about this.... You're hungry all the time so you eat to much. Let me ask this:- If you are on the way to work and you see a very desirable woman, do you grab her and attempt coitus? I assume the answer is "no". Therefore, it's a matter of self control. So, get a grip and stop stuffing yourself man.