[header] How to handle rejection [title] Have an appropriate grieving period. [step] You are going to feel upset because of a rejection, whether it's having your manuscript rejected, an idea rejected at work, being rejected by a potential romantic partner. You are allowed to be upset about that, and, in fact, it's healthy for you to give yourself some time to process and grieve. 
[substeps] Take some time out of your life to process the rejection. For example: if you can take the rest of the day off work, do that.