With all you have been through physically and mentally, I don't think it is that suprising that you are showing signs of depression. Talk to your doctor about your depressive feelings and maybe think about seeing a therapist to help you get through some of your issues with talk therapy. Good luck.
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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