I'm having the same problem, on both sides though. When I was diagnosed with bipolar 2 last July, it suddenly clicked that all the mood swings I'd been having for years that I thought were just normal ups and downs (in hindsight, they definitely were not) were actually depressions and hypomanias. Now that I'm on meds to deal with it, and the mood swings are finally starting to settle down (at least, I think), I'm only getting a little bit of depression, or some hypomania now. Sometimes I think I might be stable, but I don't know because I realize I have no idea what "stable" actually feels like anymore. I'm not even sure I ever had a time in my life where I was stable.