I was not feeling well. So went to ER here. At 12 a.m. The doctor checked me out. He said its all in your brain. He referred me to a psychiatrist. He said something like I am bipolar. Sometimes I am sad and then happy. I can't seem to sleep tonight with these thoughts. What is bipolar? Is it something serious? I will sleep late tonight. Don't have to go to work tomorrow anyways. I am seeing the psychiatrist first thing in the morning. But want to know now what is bipolar.