First of all I hope you are under the care of an Eye MD ophthalmologist and not an optometrist. Part of this is that are very common symptoms on brimonidine In fact in 20% of glaucoma patients on the generic version the medication has to be stopped because of complaints of redness, irritation, pain and discomfort and dry mouth and bad taste in mouth. If you still have it read the package insert that you get when you get a new bottle of medicine. Or go on the internet and read the side effects. I would be worried about being under the care of anyone that did not recognize these as common problems. If you see an optometrist I would suggest switching to an Eye MD ophthalmologist, if you see an ophthalmologist I would suggest getting a second or third opinion from a different Eye MD perhaps one that specializes in glaucoma. If you are not on latanoprost or Lumigan or Travatan Z they would be good alternatives also your eye doctor should have discussed glaucoma laser therapy. sometimes laser can be used and you don't need any eye drops. Please act on this.
JCH MD