Bi-polar Symptoms?

My 29-year-old son has been dagnosed with bi-polar. Does anyone have more information they can give me? My son has always been high-strung. He is emotional, easily frustrated, has a flash temper, and has mood swings. He is often exhausted, has a sleep disorder and as a child was very hyper. His volatile personality is ruining his marriage. When he was at home it was like living with a time bomb, although 90% of the time he was a nice, mellow guy. I was hoping he would outgrow it, but I am pretty sure it is some kind of chemical imbalance that he can’t control. Does this sound like bi-polar to you?