Bob, I'm sorry you've had this setback, and I will pray that you don't have any additional cancer, and that if you do, His healing will touch you and make it right.
I know you are a man of faith, and a great example of courage in the face of these medical issues. And you are absolutely right, He addresses this "why do the good people suffer?" several times in Scripture.
When I experienced cancer of my own (bladder), I fell into thinking that He had given it to me, and I didn't understand why.
Through grace, I learned to understand that God doesn't "give" us cancer or any other disease, nor does he inflict other types of pain on us. He loves us, as a good father loves his children; he wouldn't hurt us that way.
The world He created was a perfect one; that was His plan. But evil -- in so many forms, including disease -- was introduced into His perfect world by our forefathers' rebellion and wanting to be equal to Him in wisdom. We too are affected by all this, as we rebel ourselves, so I understand my own part in perpetuating the bad, but also in seeing and being grateful for the good, His mercy.
What He does with that is, He can bring good out of every bad thing. In my case, I grew tremendously in my faith and trust in Him by having cancer and, so far, being healed of it. In short, I trust Him for the good things that happen, and I "blame" the bad ones on the fact that nothing is going to be perfect again, as He intended, until a day that is sure to come.
I know you understand these things already. I hope that, by someone else reading this, he or she might have a better understanding of these hard to comprehend situations we encounter -- for solace, and comfort, and optimism in the face of dire need.
I am not trying to make this a "religious" thread. This is about supporting you in your struggle, and for all of us to appreciate in a greater way that He is at work here, even in the midst of the bad and difficult.
God is blessing and keeping you, Bob. Be of good heart.