You know too much. I can definitely understand your fears. It's hard to be rational and discard them with all of your knowledge.
I was very obsessed pre surgery with fear Of stroke from AFIB during surgery. (Which didn't occur) because you have to stop anticoagulants for 48 hours prior. And before I found the surgeon I was preoccupied /obsessed by finding the right surgeon...whether to wait the year+ in Canada, go to Bellingham, or to Seattle, who would help after, where should I recuperate, blah blah blah.
I'm not a religious person, but I started going to meditation with a friend at the Shambala center. Maybe I did it for the social aspect...I met a group of very friendly people (remember there aren't many here) and my friend and I made it a weekly thing..dinner then meditation group. Of course I practiced at home daily. Several months later I realized that I had stopped obsessing about all those things and things fell into place, I found the answers and I was calmer. I amazed myself. Was it the meditation? Who knows, but I was calm.
Hep C has a cure now, so not to worry about that one. The others, well they haven't shown themselves, and the window is closing. So toss that aside for now. You knew the risks before but they didn't stop you so this is just self-torture.
STOP READING INFECTION STORIES. I know, I read them too, and then I worry. But I'm not going to focus on them. Right now maybe you should stop.
Yes, it seems that there is a risk long term for infection, its too late for that to change as you already have the knee replacement.
I know about the infections you encountered in SL and I think you are amazing to have put yourself there, in the midst. Perhaps it's something you may need to reconsider, although, to be realistic, the microbes that infect joints are right here all around us in the relatively sanitary western world.
About being tired, get a blood work up to assure yourself. You'll need that anyway pre-op, won't you?
There is a lot about this journey that is just mind altering. But I imagine so was SL. And you survived that.
Hope I'm not coming across as lecturing. That's not my intent. I'm hoping you can find some peace in all this worry, and bring it back to the 15 minute box.
Love, mamazipp