Bren, welcome to IHD. Your apprehension is entirely understandable and is very common. Most of us, if not all of us, here at IHD have felt the same, whether dialysis looms ahead for a family member or for us ourselves.
Let's take this step by step, at your own pace. Since it seems likely that your husband will start dialysis before he is transplanted, let's focus on dialysis. There is a lot of information about dialysis online, so much so that it is overwhelming. After literally years spent looking at all sorts of websites to learn about it, I found that Kidney School is far and away the best resource for patients and their families. Here is a link to it:
http://kidneyschool.org/Click onto "Modules", and it will take you chapter by chapter into the world of dialysis. Remember that Kidney School is written for patients in mind, so the information is presented in a legible and accessible way.
So, start with Kidney School and go from there.
"Jumping Through Hoops" should be the title of any book written about getting on the transplant list because that's exactly what you do! It can be frustrating, but the point of those hoops is to make sure that your husband will be fit enough for surgery. If he needs a stent, then so be it. It will make him healthier so that he can survive surgery and be well enough to enjoy his new kidney.
If you suffer from severe depression, I am assuming that you yourself have a medical team who looks after you. Can you approach them with this latest set of challenges and ask for additional support?