To add to what others have said, there can be other extremes (high or low), like anxiety, agitation , paranoia, rage, fear. I'm mostly depressed, but have high stages of mania with euphoric feelings, high states of energy, but can never focus long on one thing. My depression used to be extreme and long to the point of suicidal. And then there's the mashed mess in between. I denied it for a long time, no doctor could tell me I was bipolar. It wasn't until I was clean and sober for a couple of years and was married to current husband, was off my meds, and jumped in a dangerously cold lake in April, that I began to accept that I had it. Trying to figure it out and understanding myself and hope to cope is a life long process. (I was first hospitalized 20 years ago and the lake incident was just 8 years ago)

Don't rush things. Just take your time with it. Learn to understand you so you can help yourself and anyone else who may be involved. Good luck to you.