Travis, I don't have anything to add on the health front.. a lot of interesting suggestions offered here already.
I've also been through major surgery as well as chemo for cancer, so I know what kind of job that does on one's life and on one's hope for a normal energy level. I still have bouts of fatigue and wonder what might be due to previous issues, to old age, or to a possible recurrence. I know what it's like to feel as though someone just took the batteries out of the back of the Energizer Bunny. It's the difference between simply "tired" and "utterly incapable".
What struck me was when you said, "I do not know who I am." And I think that could be an interesting point of exploration. This may not jibe with your christian ethos, but practically speaking we are not so much fixed individuals as Processes.. Processes which (majorly) involve organisms more numerous than ourselves. We are ecosystems. Buckminster Fuller put it this way: "I Seem to Be a Verb."
So I think it's ok to not know exactly Who You Are at a given point, since it's an ongoing and fluctuating proposition—a work in progress, of composition and decomposition both, depending on context. To some people that idea is a relief, to others it's ok.. whatever, maybe, and to others still, it is a terrifying concept which they would reject. I actually find peace in it.
I don't know what else to say except to condemn that thieving logger to one of the lower pits of hell (except he is just one of the ongoing processes, too).
I hope you can find some respite. I really appreciate the frankness with which you've shared your issues. You've always been one of the people I've had in the back of my mind to ask sheep questions of (once we got sheep). That will be a ways away, still, but I will remember your great generosity in this forum in any case.