How do I get my appetite back?

The last couple months I've been working the graveyard shift and it's killing me...emotionally, physically and mentally. I have completely lost my appetite and i barely eat, just snacking. I try to eat solid food and i feel full quickly or I feel nauseous. I recently looked at myself in the mirror and I look kind of anorexic. I can't afford to lose any more weight. Thank God I only have about 2 weeks left and then I'm back on day shift. What do i do to get my appetite back? How to gain my weight back? None of my clothes fit me anymore, not even my pj's!! :( I'm taking a bunch of time off so I want to start now. Any tips and help will be great! I want to be healthy again!!!