Bah! Sorry you're in such a dark place Henny...
I think there are two ways to look at the food thing you're going through.
1) Don't force yourself to eat. You're upset and forcing yourself (or being 'encouraged!') to eat won't really do you any good. If this lack of appetite continues, certainly don't gorge on unhealthy stuff like take aways and chocolate, because the greasy, fatty, sugary stuff will make you more down - because you're putting bad stuff in your body and that stuff also does nothing for making you feel 'healthy' and better. Make fresh, tasty, nutritious food that will help boost your mood. Eat little bits of fruit and veg to keep you ticking over. It's easier to eat an apple if you've no appetite, than a muffin or a wedge of cake.
2) The other way to approach it is that conquering this thing that's happening to you is more important than what you're eating. So just eat whatever you need to, to get through it. When you start getting better, start thinking about healthy eating again.
Personally, I'd suggest trying the first approach, just because in the long term, once you've started getting over what's happened, if you've also been healthy, you may be in a better place...if you get what I mean? Also, it's something you can control and focus on. If you start getting into despair, start thinking about food, planning meals, menus and shopping lists...it could help distract you!
Whatever happens tho chick...hope it gets better for you soon. x