Ultramar's last comment is inaccurate. Whilst not classic DSM or ICD symptoms rapid cycling BP2 is well recognised clinically and can be very rapid indeed, includingseveral times within the day (ultradian)

Bipolar 3 is a contentious diagnosis and is defined by a reaction to antidepressants or some other therapeutic intervention such as light therapy.

Your symptoms are obviously very uncomfortable for you and you need to get good clinical care. Are you in the USA? If so then there is a black box warning and bipolarity should be screened for before a diagnosis of depression is made. This can be difficult to do but you appear to have had poor reaction to antidepressants. The evidence that they can flip patients into mania/hypomania is also contentious however, I believe that I have experienced this.

You should discuss mood stabilizers with your clinician. Lamotrigine is believed to be the one of choice with BP2 and it has antidepressant effects. Be careful with self medication, St John's Wort is not side effect free and can react with other medications.

As well as medication there are a number of effective behavioural strategies you can use, such as Mindfulness and Social Rhythm Therapy. There are others.

Having experienced misdiagnosis and therefore, inappropriate treatment for depression for many years, I realise how important early diagnosis for BP and treatment is.