Stuck

For 15 years I've had moderate to severe mental illness. In that time I've had multiple diagnoses from Panic Disorder to Bipolar type 2. But after 10 years of medication things haven't significantly improved. I'm past the crisis points of multiple panic attacks per day, agoraphobia and laying in bed all day with severe major depression but now my daily feelings fluctuate between hopelessness, anger and feeling overwhelmed. I struggle to hold down a job and my family life is in tatters including the loss of relationship with my two young children and the guilt I feel because of my poor ability to be a stable parent. Most of the health professionals I see don't think I have Bipolar however they wont remove that label. Other diagnoses have been suggested but nobody seems to look further into what's going on or see the distressing place my life is in. I don't think that I have Bipolar, but clearly something is not right. I feel I need to know what I'm dealing with, I would like a diagnoses that I feel confident in. But my health professionals just say deal with the symptoms, not the diagnoses. I feel my problems are so massive and complex and I don't know how to tackle such a big problem. I feel that things need to be more focused and not so broad.
I feel like I've exhausted my resources and my GP and Psychiatrist seem to sit on their hands with only the offer to try other medications. I don't know what next for me, my life feels stuck and where I'm stuck feels very uncomfortable and unhappy.