"he makes all kind of excuse to justifies his action. "Too much stress at work", I am just having fun", I didn't do anything wrong", and the list goes on"
Of course, his manic fun is his reward for having been down in depression for so long.
For someone to have the gall to even suggest that he get off the carrousel just when he is starting to have fun is nothing but a spoil sport who is jealous of his successes. He is unreachable as you know.
You say, "He is very stubborn with an inflated ego."
I have the same situation, huge ego. Combine that with mania, a string of successes, no medicine, and you feel like you're actually flying. And anyone who tries to stop you is just jealous.
When I went on Lithium, I didn't loose any enjoyment. It's just that my victories were tapered just a little bit, just enough to keep me on the ground, which is what I wanted.
I probably got on Lithium, by first being treated for depression. I could understand being treated for depression, it was not a possible lowering of joy. It was an increase in joy with an anti-depressant. I liked that, because my depression was so crushing, I knew I had to get out of that.
Then my psychiatrist recommended Lithium. I balked a little bit, but with enough trouble, I guess, I got on it. That was probably 25 years ago, and I've been on it every day since.
I wouldn't even think of stopping it. Read some of those stories on the net, maybe he should go to another psychiatrist. "A psychiatrist who treats himself, has a fool for a patient," I guess.
Maybe when he's depressed he's more likely to see someone for help. Huge ego, mania, successes: big problem.
One thing that has helped me is:
"One problem at a time, and be positive about that problem."
I didn't know it, but I use to be negative. If you can do short and long term positive, it might improve your chances. And be positive about yourself, no matter what happens with the other.