I get very depressed easily, but then get really happy, and really depressed and irritable within seconds over nothing. could i be bipolar?

Mood changes: The mood fluctuation, irritability, aggravation, been snappy zippy and irritability can be part of depression as well as bipolar or anxiety underlying issues need to be evaluated carefully by a psychiatrist before a diagnosis is given.If your functional ability is compromised seeking good timely care will be best decision.We have a lot better meds if needed to address the mental health issues now.

Unlikely: Bipolar disorder means longer periods of extreme moods — weeks, not seconds, minutes, or hours. Regular (unipolar) depression is more common, & often includes irritability. Brief mood swings are often a personality issue, not a mental disorder, especially if it's a long-term pattern. Some medical conditions & drugs (recreational or prescribed) can make rapid mood swings more likely too.