What are some ways to cope with rejection from a coworker?

So I told a coworker, my feelings and I got rejected. I am going to have to work with him everyday, what should I do? I have phoned in sick the last few days just because I am honestly scared to even look at him anymore. He even messaged me asking whats going on? What are things I can do? My work is team work, were everyone workds and talks to everyone so it will be hard to avoid him….

I have a entry level job, so I could quit and find something else?