Hi and welcome! All my advice amounts to is... if you're not hungry, don't eat, if you're hungry, eat but make it something healthy about 80-90% of the time, have less healthy stuff now and again if you really want it, and without guilt, and I second what Lotus7 says about getting out for walks, it really has helped me and it's great for stress, plus I feel much better afterwards. Plus if you can find some kind of exercise you love just for the sake of doing it, that's great! Anything counts if you're not sitting or lying down!
If you want something more structured, there are forums for every kind of plan
Ps: post here as often as you can! If you find the support system helps, you'll definitely find it here

As I've got to kinda know a few people I look forward to posting, and I get great advice and encouragement
Hope to see you around the forum more, and that things start looking up for you after the accident