Welcome 1rsates,
You have been through a lot, glad you are doing well. Since you are on a LC forum, that is what I will recommend but obviously you must check with your doctor if having one kidney would compromise your ability to metabolize protein.
My comments are: 1. LC does not have to be high protein, it is only moderate protein, and a few doctors like Ron Rosedale recommend quite low levels. LC is a high fat diet. Only about an hour ago, DietDoctor posted " Top ten weight loss tips for women over 40 " and the first one is about Not overeating protein. https://www.dietdoctor.com/top-tips...w-carb-women-40
2. A Low Carb diet should be the first line treatment for T2 diabetes, good info on that here: http://forum.lowcarber.org/forumdisplay.php?f=45 You would be overall healthier by controlling your BG through diet to reverse the T2. http://forum.lowcarber.org/showthread.php?t=467426
3. I am a also a cancer survivor for ten years and it is one of the reasons I started and continue to eat No Sugar, no starch and no processed seed oils. The research in the past few years on using a Ketogenic diet in conjunction with conventional cancer treatment has exploded. There is one thread about cancer here http://forum.lowcarber.org/showthre...13&page=1&pp=15 An extension of this research is to also use a Ketogenic diet for prevention of a recurrence.
So one idea may be to read a new book other than Atkins or on-line website like the one linked above to get more information on how a well-formulated, only moderate protein diet could work for you. All the best,