I'm afraid I don't know what bipolar spectrum disorder without mania is. You can't be bipolar without mania, or at least hypomania. To be honest, I think some psychiatrists make things up when they can't identify what your actual issue is. Anger and irritability is associated with different times in the bipolar mood sing for different people. For me, anger and irritability are associated with hypomania and mania. For others, I have heard it associated with depression.