Last thing I was diagnosed as was bipolar disorder, but the manias were only ever caused by being on too high doses of anti-depressants. Without the ADs I don't actually ever have manias. It's mostly long periods of low grade depression with the occasional burst of "normal" and very infrequent complete mental shutdown depressions. With the correct dosage of the right AD, it's long periods of "normal" with very short periods of very minor low grade depression. With the wrong/too much ADs it was short periods of kind of hyped up alternating with short periods of absolutely insane manias.
I'm iffy about going back for an accurate diagnosis because the meds are working ok, and everyone I've ever been to was a big fan of "I've decided you're something else now, now let's see what THIS does to you!". I just keep going back and getting the same prescription with a "No, you were absolutely right last time. Works like a charm!" There's also a PTSD diagnosis that kind of complicates a diagnosis of any other problems. I was given a benzo for that, and it helps with the social anxiety component of whatever it is I actually have. So right medicines, probably wrong reason for one of them, but I've learned to take what I can get.
My mother was also diagnosed with dysthymia, as was her mother before her. So it's probably the right one.
FWIW: My mother is on low doses of a pair of anti-depressants that have completely changed her life. So about the best thing I can say about it is that there is hope for a diagnosis of dysthymia.