Hi cheza and welcome
Also sorry to hear your news. I had laser about 15 years ago (about 6 sessions) and whilst I have lost a bit of peripheral vision I can still see well enough to drive. Glad to say there have been no more signs of retinopathy since (I am checked once a year).
I also had stomach problems with deficiencies in Calcium, Vitamin D, Folic Acid, B12 and iron, This has all resolved since I was put on a gluten-free diet. I felt really terrible in the months running-up to that.
I think my kidneys are OK so can't comment on that.
Hoping it turns out to be not as bad as you might imagine, although I know it's a worry.