Suggest Treatment For Bipolar Disorder

My husband has been diagnosed with bipolar. He was prescribed lithium 300 mg twice a day and 40 mg Paxil. Life seemed to be going well until he had a back injury at work two years ago. He had to have a 360 degree fusion in September 2013. They removed hardware September 2014. He has had to go to pain management and is currently taking 60 mg extended release morphine twice a day, zanaflex 4mg four times a day, gabapentin 800 mg four times a day, and amitriptyline hcl 150 mg once at bedtime. He has nerve pain some days in his leg that puts him in bed. Lately he is super anxious, itching so much he has sores that seem to take forever to heal, he is super emotional and gets agitated easily. When he lays down to sleep he twitches and jerks so bad that I have to go to couch. We have had a few problems with pain management doctor so we are going to ask neurologist to change doctors for us. I am here watching his life basically fall apart and I need to know what I can do to help. I feel he is over medicated. He often sweats profusely too.