If you have a choice live where you are happiest. Don't think your return of symptoms has anything to do with the change in weather in AZ. Some lupers are affected by very cold and damp weather like many arthritis patients. Unless you live in Flagstaff it is not that cold in AZ.
If it is a fallacy that everyone with lupus is sensitive to the sun. It does not affect me at all. But some lupers have a terrible time and if they live in the south or southwest it is more difficult. Some have raynauds phenomenon and living in a cold climate is painful. I have it and love winter sports but have learned to dress to cope with temps down to -10F.
How is your lupus being treated? There is a definite neuro psychological impact from lupus for some patients. It hit me but only in short term memory and concentration. There was a distinct change in 1 month and it has gotten a little better over the past 4 years. If you are taking prednisone that can also cause problems.
MCTD (lupus, scleroderma, polymyositis). Diagnosed 2005. Kidney, liver, GI tract, dysphagia, raynauds, Barretts esophagus, quadriplegic in 2005. Recovered and now active in skiing, tai, chi, hiking, golf. Meds: prednisone 2.5mg, imuran 25mg, amlodipine, benazapril, omeprazole, potassium, folic acid, vitamins, maxide and various supplements and vitamins.
Remain optimistic and you can overcome the odds.