Are you sure it wasnt some kind of midlife crisis? I dont know your story besides what you have shared here and thats what stands out for me.

In saying that, I havent been proper hypomanic for years. My meds do their job to keep that away but the hormone related depression is another story. IMO my depression now is caused but hormones and unrelated directly to the bipolar. Could have hormones had an effect on your behaviour at any time? They can make some people appear "manic". Im diagnosed as BPII so I have a hell of a lot more and deeper depression than high times.

Keep in mind, if you dont need some meds they can work to keep you depressive. Be aware of what you are on and how it can be affecting your mood.

Goodluck, I hope you get some relief from depression soon.