I was diagnosed schizoaffective when I had my first episode for mania because there were mood and thought processing issues together which met both . Then I had a severe depression episode and another manic episode so was diagnosed for bipolar. For a while it was there but less severe so I became bipolar 2 and later I became more severe and was determined to be bipolar 1 . I think diagnosis is used to treat and communicate sets of symptoms so as you have more history the easier it is to get right. I have psychosis in episodes also and a seasonal pattern.