The important thing is getting the right treatment so you can function better. Irritability can be a part of bipolar but you need to meet the criteria for at least one hypomanic and or manic episode, although these can co-occur with depression leading to a mixed episode. Mixed episodes are notoriously difficult to treat. What kind of meds are you on? As you said it looks like they need tweaking or replacing. What is the most difficult thing you are struggling with right now?