I can only speak as someone with Bipolar Type II, but the worst symptoms I personally face are those of depersonalization or dissociation. Dissociative symptoms are not experienced by everyone diagnosed with the disorder, however for those who do experience them it can be debilitating and severely impact daily functioning. Mixed states (a combination of hypnomania and depression in simple terms) are also dangerous, as these emotional states are when self injury are more likely to occur. This is due to depressive symptoms combined with the energy provided from hypomania.