Am I overreacting?

Today at work I felt extremely depressed. Not for any reason specifically, I just can’t stop crying and feeling sad. I couldn’t take any phone calls and spent basically 4 hours in my chair starring at the floor. I called into my Ob and told them I was concerned but didn’t want to be on a psych hold. They recommended just coming into the ER if I felt I needed to. So now I’m going to the ER. I’m not overreacting am I?