Re: gfr dropping!
While those numbers do indicate a problem, you are not in dire straits yet. Part of it could also be simply due to dehydration when you had your labs done. Always be sure to drink a lot the day before and keep this up consistently for labwork.
There are things you can do to help maintain kidney function. This includes glucose control if you have diabetes, bp control, and cutting back on salt and animal protein. Hopefully you will have spoken with a specialist (nephrologist) and the team can give you an idea of what other things you can do which may include some low dose bp meds even if your bp is normal.
Hope this helps a bit.
Dxd T1 1966, 2001 dialysis, 2002 kidney transplant, 2003 insulin pump, 2008 pancreas transplant