@Muse - It is certainly true that one symptom does not make a diagnosis. But I'm a little concerned here about the general confusion of Bipolar I and Bipolar II, and the fact that these are two very different illnesses.
I want to make it very clear to Lee, and anyone else posting and reading here, that Bipolar Disorder and Bipolar II Disorder are NOT the same illness. Bipolar Disorder is a very serious condition and needs to be taken as such, but so is Bipolar Type II. Bipolar one, Muse, you're absolutely right about extremes of behavior being one of the most prominent features of Bipolar Type I. The lack of the hallmark extreme manic episodes of Bipolar I, which is more generally known just by the name Bipolar, is something that creates difficulties in understanding and diagnosing Bipolar II.
Bipolar II is a scary, insidious, underdiagnosed, and undertreated illness - particularly for those with other diagnoses like PTSD/ other anxiety disorders, and depression.
One symptom I forgot to mention in my previous post is something called "rapid cycling" - this means that your mood can go up and down very quickly without warning, sometimes multiple times in one day. Sometimes over a week. Everyone's experience and timeline is unique, of course. It is similar to having mixed episodes. It's difficult to treat. But keep in mind the fact that the extreme polarities of behavior are less notable in Bipolar II. In general - though this isn't always the case - the depression is dominant and you have to look for hypomanic episodes, which are less extreme than the manic episodes that are a hallmark of Bipolar I, and almost never present in Bipolar II. In fact, that's one of the main differences in the DSM - hypomanic, aka "less" manic, episodes are part of Bipolar II. Major manic episodes generally land you in the realm of plain old Bipolar Disorder.
I would think it would be hard to diagnose this type of bipolar?!
It is extremely difficult to diagnose, especially when dealing with multiple illnesses... Mine came about partly because not one single antidepressant in one single class ever relieved my depression. That's me. Sometimes, antidepressants can throw those with Bipolar into strikingly bad manias. For me, they just didn't work.
Currently I take some meds that are less traditional mood stabilizers and low-dose antipsychotics - yes that sounds ominous but it is just the same as any psychiatric medicine and a first-line treatment for Bipolar II. Has worked quite well for me (especially in comparison with antidepressants) and very much helps my severely disturbed sleep. Some of the antipsychotics can make you quite sleepy, so there are some meds that are 'traditionally' prescribed twice daily to treat, say, schizophrenia, but one larger dose at nighttime can be helpful with Bipolar Type II. Everyone's different.
It did seem to me that
@Lee2001 was referring to a cluster of symptoms, not just one symptom, but perhaps I misunderstood the post. Of course, do not walk into an appointment announcing you've diagnosed yourself and what treatment you think would be appropriate. But I'd go in, list the symptoms, see what the doc says and then, if you still have concerns about a specific disorder that the doctor has not addressed, ask.
I hope you figure this out, Lee. It's a rough road. If you'd like to know more about my personal experience with Bipolar type II, PM me, otherwise you can look Bipolar II up online for more general info.