@larry1943 I of think of GFR as a measurement of how well your kidneys filter poison out of your blood, so if you dilute your blood (either by adding blood products or being hydrated) the test seems like you have less poison when really you just diluted your blood. I wouldn't focus on the 3% fluctuation, in the big picture it is not a significant change.
What I really care about here is YOU! Even after just a few posts it is clear that you have been through a lot and have fought your way through many close calls. I want you to keep fighting!!! Prove your doctor wrong. Get the fistula, fight through the adjustments that dialysis brings, continue to inspire others. You can do this. As someone who's been in end-stage renal failure I can tell you first hand our brains get foggy, our spirits get weak but that isn't who we really are it is just the toxins in our blood talking. Fight Larry! You can do this and our whole community will be right here cheering you on.