How to determine if i'm bipolar?

Bipolar: Periods of agitation, grandiosity and lack of sleep, alternating with periods of sadness & lack of energy and appetite changes, basically highs & lows.

See a psychiatrist: Mania is the most characteristic feature of bipolar disorder, but most people also have depressive episodes. Mania leads to impulsivity and decreased need for sleep sometimes accompanied by increased irritability. Depression leads to decreased interest, motivation and energy associated with feelings of worthlessness, hopelessness. And thoughts of death or suicide.