Everyone who is "high strung" are not bipolar.
But ... I feel your pain. My PTSD can sometimes present as a Mood Disorder.
There are three ... four routes that may be open to you ... Especially if you want to avoid all those pills.
1. YOGA
You're as young as your spine.
There's tons of evidence that shows how we store our emotions (including our traumas) in our major organs.
(7 Chakras)
Yoga is the best way to "stretch" them out... relax the "body-mind."
I go to the local YMCA where there are a lot of different yoga classes included (free) with the membership. I see a lot of seniors attending.
2. Meditation
You may not be able to cope with meditation if you're bipolar.
If you did take a course, you'd need to get a VERY knowledgeable teacher you trusted and STICK with him or her... and join a Shanga or "spiritual community" associated with the meditation group.
3. TRAUMA WRITING
Sometimes we're carrying a lot of pent up emotions that can be written about by looking at incidents from many different perspectives. (i.e. Tim O'Brian's best seller: "The Things They Carried.") There may be a "MeetUp" group near you. Senior centers also may have one.
4. County or University (FREE) discussion groups, art therapy classes, and mental health writing groups.
5. Exercise.
Of course... exercise is always extremely valuable.
Going for long walks... swimming at least three times a week.