Wow! I'm sure that was an immediate change of life moment. I know exactly how you feel, I have been there in 2020. I had severe cirrhosis that affected my kidneys as well. My GI doctor even told my wife there was nothing more she could do for me and I could go anytime. She then referred me to UW hospital for a multiple organ transplant if I lived that long, well obviously I did and I did! There will be many tests ahead for you, but keep the faith that God will be your consulting physician, and I'm sure you will be just fine. Do as the doctors instruct you and trust that they want you well. That's what they do for a living.
Calm down, it might sound easy to say but it will make the process easier to accept.
God be with you