Xalatan and iop

Back pain, neck pain, reduced joint mobility, fluid in throat and lungs, general fatigue. Starts about 6 hours after taking drops and starts to decline after about about 20 hours. The back and joint pain cause sleep problems. Xalatan was effective for lowering the IOP and have not been able to directly trace (or attemped to trace ) any of my other vision problems to the medication.

My mother is currently using Alphagan-P to lower her IOP. Her doctor has recommended that she switch to Xalatan or add it as a second drop at bedtime. I want to be especially cautious given that she is monocular and 90% of her optic nerve is damaged ( she seem to be progressively losing her perpheral vision despite an IOP of 13-17 ), and she has some macular degenerative problems. I understand with Xalatan, there could potentially be macular side effects. I would appreciate it if anyone has used Xalatan or Alphagan-P to comment on side effects that they may have experienced or efficacy and also if anyone may have some insight or perhaps personal experience related to this. I would be so very, very thankful for your help.