Hi Astro,
Congratulations on 7 months sober! Be proud of yourself.
What I had to do in recovery was to begin to like/love myself. I never had and there was no self-respect - hence the alcholism. If you care for yourself, you will not be inclined to live in a messy house or to eat junk food. I think recovery involves working physically, mentally and spiritually every day. I need all three in order to move forward.
Try to start slowly and maybe begin by eating well for a week. Then add a moderate exercise program. You'll be able to feel better about yourself and to move forward.