I know you are in a tough situation. Maybe you should ask your doctor about effexor as an alternative to your current medicine. As far as energy, start with your diet. Don't eat too much fast food and eat more vegetables. Take some vitamin supplaments too. For working out, maybe you should start with some dumbells at home. It will get you started till you feel confident to go to the gym. Make sure your girlfriend understands that you need her support, understanding, and encouragement. She will help you get through it.