I have just been diagnosed with bipolar, I forget if it's I or II, anyway in the past I had true manias, then some hypomanias and now recently I am just basically depressed all the time, varying degrees, but depressed. I have been told that my moods are often mixed and cycle rapidly, as you mentioned, within a single day. I am married and my husband tries to understand. I have a 17 year old, but it's hard for her. I really only have one friend, who herself gets frustrated. I am not working, after having worked for years successfully. I have been tried on a number of medications and am now just trying to wait it out until I am at my therapeutic level. I do know that I don't just have depression only though, due to the mania in the past and brief ones now. I am going to look up ultradian bipolar, I've never heard of that and I used to work in the mental health field, for a number of years as a social worker. My mother has bipolar, which has been managed with medications for years, but for various reasons I have no contact with her or other family or origin members, so I can completely understand your isolation issues. Best of Luck to you, hang in there, it's all I can do most days, but I try to remain cautiously optimistic about the future.