If you are angry with someone or feeling for something, why are you not eating and making your stomach empty ? What did the stomach do to you ? And also not sleeping well. By not eating and not sleeping nothing will happen except spoiling your own health by yourself. If the thing is really worth to feel just eat and think what to do. Don't just sit and feel all the day and spoil your health. Without adequate sleep there is a lot of issues stepping into our body which we knew already. So not eating and not sleeping will not gonna change anything unless you take an action for it. Eat well. Sleep well. Stay healthy.