If you can't discipline yourself to stick to a diet, fat-burners aren't actually going to do you much good. Technically speaking, they only boost fat burning a very small amount, and personally (having been burned that way myself) I don't think they are a good idea; they depress the function of thyroid and adrenals, are more or less physiologically addictive (because of the stimulant effect), and can cause fat GAIN when you come off them.
3 pounds a week is a bit quick to be totally healthy, but can be done; you'd probably need to go on something pretty stringent, comparable to a competition diet to do it. There again, you are going to run into the problem of gaining it back post-diet, and you will still need to buckle yourself down against the cravings.
I don't know how your particular mind-body craving mechanism works, but if it's purely physical, one thing I'd ask is "are you getting your essential fats?" Fish oil or flax oil/seeds or Udos make a big difference to me in cutting the "my body NEEDS nutrients!" cravings. Same goes for a good multi-vitamin supplement, and plenty of low-cal, dark-coloured vegetables; technically, by dieting, you ARE starving yourself more or less, so it's important to pack in the micronutrients.
For the psychological ones: first, if possible, get every single little thing that isn't "legal" diet food out of the house. Out. If it's not there, you can't eat it. Your time's tight, so cheat meals probably aren't happening in your case, but a small planned treat, if possible, can give the junk demon inside something to look forward to (there again, purchase one small serving of the cheat, so that you don't go crazy and eat the whole bag or box or whatever, just because it's in the house). If you crave, drink water. If you still crave, drink more water.
But none of these things will work if you do not, deep within, have a commitment to your goal. If you cheat, you are cheating yourself; you've got to know and accept that. If you've got a clear, positive vision of what you want to achieve, and exactly what you've got to do to get there, that's what gives you the resolve to turn away from the fleeting pleasures of crap food. Whatever that goal is, wedding or class reunion or competition or simple good health/fitness or whatever, it's got to be something truly important to you, not something you're trying to convince yourself is important.
...roflmao.