Can you talk him into seeing a doctor? Even his GP should be able to help if he is will to go. That's what he needs right now is medical help. Good luck. It's great you are sticking by him even though he is pushing you away.
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Bipolar I, Depression, GAD Meds: Zoloft, Zyprexa, Ritalin
"Each morning we are born again. What we do today is what matters most." -Buddha