Over and Under

Hey all,

I'm doing my best to eat properly, although admittedly I am still working on eating regularly and the right food and the right meals. I'm hoping to get there gradually, but i'm one of those people with a non-set timetable and being in sterile environments I can't just pop-out a lunch box :( , but I'll get there. Excuse me, I ramble without coming onto the point

Ever since seeing a picture of myself, I have been horrified at how I look and although my stomach is rumbling and I keep telling myself I want to eat and I keep thinking about food, at the same time I can't bring myself to go and eat it, because I am terrified of over eating. At the sametime i am horrified of under eating and damaging my body. I just want to know what is too much and too little in terms of calories.

I am eating, (probably a lot of the wrong stuff but I am trying my best to modify everyday)