Hi, Secretum!

From my understanding, if you are experiencing eurphoric high moods (in other words, mania), you cannot be Bipolar II. Bipolar II presents with hypomanic and depressive episodes, but lack the mania of Bipolar I.

My girlfriend has Ultradian Cycling Bipolar I. Unmedicated, she experiences multiple mood episodes within the same day. This is the primary symptom of Ultradian Cycling. As your moods are lasting longer, up to a period of days, it could possibly Ultra-rapid Bipolar I. But trust me - for the Ultradian cycling, it is very definitively multiple cycles within a 24 hour period. She was unable to sustain a consistent mood for a period of hours, let alone a full day.

From our experience, there is no suspected symptom too small to mention to your psychiatrist. That is what they are there for - it is there job and their responsibility to you to take everything going on into account when working on your treatment (or diagnosis). Bring it up - your psychiatrist will either be able to calm your worries over it or move forward with a new course of action.

On a side note - we thought my girlfriend was Borderline for nearly two years before we realized that she had more of the symptoms of Bipolar disorder than Borderline. They do share a lot of symptoms.