Humidity has been pretty oppressive recently, 58% here right now but it's been in the 70% to 80% range frequently. It would help if we had a nice breeze but that seems to be in short supply. I'm 68 and don't think the humidity bothers me much more than it did 10 or 20 years ago... it always sucked.
I heat with wood and cut 1 to 2 cords on my own land for 9 years, hauling it back to the house with a wheelbarrow on narrow winding trails. It would take 40 to 80 hours of hard work between cutting, hauling, splitting and stacking. Good exercise, but it was starting to get old and my romantic notion of "self-sufficiency" didn't seem like enough reward. And there are lots of risks from chainsaws and falling trees.
Two years ago I started buying firewood and getting it delivered. It's expensive, but the quality is way better than the stuff I was cutting that had a lot of rotten parts. So I'm burning less wood for the same amount of heat - seems like money well-spent and I have found better uses for my time. I still get some exercise by carrying it all to the porch and stacking it, which takes several hours.
Hey - take it easy out there and get inside to cool off if you can. I try to just make the best of things regardless of the weather. Doesn't help to complain, but I do it anyway.