Welcome! It sounds like you're doing great!
Don't be so hard on Arby's - it's my choice for
diet fast food. An arby's melt is only 303
calories and has all the deliciousness of beef & cheese on a bun. I can resist hamburgers if there is an arby's nearby :-)
As for exercise at home, a couple of ideas. First - try finding workout shows on TV. Most of them are kind of lame, but it'll get you moving.
I also play Dance Dance Revolution - if you happen to have a playstation it's fairly cheap in comparison with a
treadmill.
Hula hooping is a great workout. Jumping rope is too! Or take up a new skill like juggling, yoyo, learning to stand on your head - anything is better than sitting on the couch.
You can also do a lot of
strength training at home. Use a gallon of water as a weight, or just do the
exercises without
weights. Lunges, crunches, stretching, all great stuff and easy to do without having to buy a thing.
Hope this helps!