Noni*e, do you reckon you get the fast food because you crave it or because it's easy? I know when I get takeaway a huge part of the attraction is because I don't have to cook it!
Can you buy some yummy frozen meals or make extra to freeze when you are in a cooking mood?
Or maybe ration things? Allow yourself one takeaway a week, so that you end up saving it for when you really need it? Or only buy yourself a certain amount of junk each week so when it's gone, it's gone til the next week? I know those are things that have worked for us.