My mother's been Bi-Polar for about 21 years now. It's a chemical imbalance of the brain rather than something that can be controlled with therapy/counselling alone.
She has it very bad, so a nurse comes round every two weeks to inject her with medication for it (she always ends up not taking her tablets, the problem gets worse, she becomes dangerous and then commited at the nearest hospital).
The drugs are helping though - I've had some great times with my mum the last 7 years, she'll never be 100% ok but it's a vast improvement.
Unfortunately About 5 years ago she was diagnosed with T2 Diabetes. She didn't control it well and now self injects which is a great thing actully because she completely accepts treating the body with medication but will never truly understand the imbalance of the mind.