I am sympathetic to your kidney disease, but Bt is a naturally occurring toxin produced by Bacillus thurengensis, a gram positive bacteria. It has been around for thousands of years and is part of the environment.
Monsanto has said that we don't have a receptor for the toxin in their GMO food.
Never think that a bacterial toxin is a harmless thing however. It doesn't matter if it is naturally occurring or not, all toxins - with a working receptor - will produce a range of symptoms as a response, such as inflammation, fever, etc.
That is in fact why they are called toxins.
Finally, it is worth noting that much of what Monsanto claimed about this has been proven wrong. For instance they said the toxin would break down in the (human, extremely low pH) stomach, but it is not doing that.
This story is just beginning.