Hello RBarnes,
Hope you are feeling better.
It's the biggest mistake of your life "avoiding" anti-TNF. May I ask why?
Inflamation and fatigue go hand in hand, a tnf inhibitor will definately help with tiredness and significantly reduce pain in your peripheral joints too, not just spine.
AS destroys cartilage in joints which cannot easily regenerate so you I hope you reconsider your decision.