Having depression is tough by it's self, but when you add physical pain, life really gets hard. I'm assume you are under a doctor's care and someone is watching your depression as well as your physical issues. We also have a forum for chronic pain issues, too. you might try there for some support with you physical issues.
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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