Good morning Backpain!
Welcome to the Chronic Pain forum!
Many of us suffer from back pain, and understand what you're going through, and it can be a real drag on the emotions as well as the body. It looks like you're on anti-depressants, and I see that you have been checked for other types of problems with blood work. One thing many of the members here have had checked as well, is Viatimin D. Have you had this checked?
If you don't mind me asking, have you had any corrective surgery or other treatments for you're back problems? Maybe an epidural? I also see that you walk, but are you doing any PT to strengthen your back muscles?
I'm at a loss for an oral stimulant suggestion, but I'm sure some of the other members will be along to help with you're question.
"The clock is running. Make the most of today. Time waits for no man. Yesterday is history. Tomorrow is a mystery. Today is a gift. That's why it is called the present."