I was diagnosed with bipolar in 2019. Started on a variety of meds and now on lithium that makes me feel frankly brain dead. I had a traumatic childhood and dealt with a lot. I wonder have I been misdiagnosed with bipolar because they don't know what is wrong with me? Because they don't have funding (I'm in UK) for therapy/investigations? 

Everyone insists I *must* stay on my medication because I am poorly without them but I managed 20+ years without medication and fought my own demons with relative success. I feel like I have so much trauma and so much to unpack and deal with and instead I've just been given this label and that's that. 
When I stop taking my medication I *do* become poorly admittedly but is that not because they've altered my brain chemistry so much with the meds I'm addicted to them and my brain doesn't know how to function without them?

Is it likely a psychiatrist would misdiagnose? Is this all part of a plan to keep patients quiet and save on paying out for therapies and treatments with external bodies?