Drink fluids, especially nutritious ones like milk and fruit drinks, until you can regain that appetite.
I got the same feeling after not eating for too long (because I had a bad reaction to some painkillers after having my wisdom teeth removed). I was feeling so bad and didn't want to eat but I did and it got better. Try eating soups with some noodles and drink some fruit juice. It's not hard on the stomach.
Milk for me is hard to digest, even liquid yogurt was easier. But fruit juice (specially natural one) is very good. Introduce yourself to food slowly again and drink plenty.
Protein drinks, bananas, fruit, crisps/other small snacks. Maybe look into why you lost your appetite? (You could be coming down with some illness or it could be emotional turmoil :) )
Your probably low on some nutrients. You should definitely eat a full balanced meal to get back on track. Eating JUST break will fill your stomach, but will not make you feel better since it only contains so many nutrients that you need.
I have not eaten properly this past few days. It's not like I'm starving myself on purpose. I just lost my appetite. So now I'm feeling very lightheaded. It's like I can faint at any moment. I can't even see and walk properly. I know I need to eat and I did. I ate two breads just now and I feel like shit. My headache is not going away and I still doesn't feel like eating. What should I do??