Hey my name is Jamie too! ^_^... well don't feel so bad dear we all fall of the wagon sometimes. The most important thing is getting back up when we fall.
Don't concentrate on what has happened but instead what you can do NOW.

... You can do anything you put your mind to and I know how tempting those fast food places are

.
It's hard to resist temptation but just remember your goal and it should stick. Usually what I think of when I get fast food is "Does my body really need this?".
Nowadays usually all I get is Subway (though ocassionally I have snuck in an A&W or 2.)

. If I do happen to go to subway I will limit myself as well with only getting a certain sub ( my fav is turkey

) and I will only get 6 inch.
The only problem with fast food is usually it does not have as much nutrients as your body needs... and I find for me anyway once I have it (or even just pop) it seems to drag me down. So I guess one more thing that can be motivating is eating foods that make you FEEL good ^_^.
In any case, hang in there girl. You can do it!