Being fired from your job can be a very traumatic experience. A roller coaster of emotions will hit you at once as you process the idea of not having a job and how you'll manage without a steady income.
There are many things you can do after losing your job, such as networking and visiting a career center. But the first few moments, or even days, you should focus on your own emotional well-being. If you do not recover emotionally from being fired, than you won't be in the right frame of mind to start a new job search.