Leaving Office Depot

I reached my breaking point with this company a few days ago. I have a manager who is not kind, customers who scream at me, and it just became too much. I literally went to the bathroom and broke down in tears. This level of stress is not sustainable for me, my family, or my mental health.

Because I have a graduate degree, I was considering getting a seasonal retail job until I found something else. Has anyone ever left OD because of stuff like thos, or am I crazy? What is the process like to leave?