It’s harder and lonelier now that I’m in remission. What’s that about?

It's not so much the wood, unless it's a good old hardwood that is green, then they can be heavy.  I'd imagine it is the weight and control of the chainsaw.  We come home with a couple of trees recently that need trimming to wood box size but are green so they will be stacked for next year.  As you know we never knock back an opportunity for firewood 
Pace thyself accordingly