Based on what you have described here, I tend to agree with the diagnosis that the psychologist has given you. It does sound like you meet the criteria. Most people experience some ups and downs, and yes, some personalities can include some opposing traits and tendencies, but the swings that you mention here do hit some of the classic extremes that are included in Bipolar Disorder and/or Cyclothymic Disorder.
However, just because you meet the criteria for a disorder does not mean that you need to be medicated for it (or even treated). If you feel that you truly have the coping skills already in place to manage your mood and energy changes, you don’t have to pursue further treatment. But the fact that you consulted with a psychologist in the first place and state that you don’t have a support structure to rely on, indicates that you could at least benefit from the help of a therapist.
Most people with Bipolar love their highs and hate their lows, so you are not alone in this aspect. Deciding how much the mood changes impact your life and your ability to function, as well as affecting your “quality of life,” will help you with the decision to medicate. Mood stabilizers will not change your personality, they will level out the highs and lows so that you have more consistency in your state of being. But you have every right to seek a second opinion if you are still struggling with the decision whether or not to pursue further treatment. I hope this information helps.
All the best,
Dr. Holly Counts