Welcome! I'll be 58 this month, and mostly work at night driving a tractor trailer. I have to unload with hand carts too, about 45,000 lbs a week. I can certainly relate to your situation, as it's taking it's toll on me! Fred's right about the medications!
This is a great group here & many old farts, so you should fit right in. Many of us are also self taught, so we have that in common also!
Glad you can join us & any help you need, just ask. We really don't mind the questions, gives us something to do when we're not napping!