i feel for you, i damaged my back in 96, an still suffer to this day, i had to look at my work load and kept the best an sold on the rest and still earn good money and only work four days a week the long weekend helps me rest my back. since i reduced my work load ive not had as much bother with my back, also i get a full back work out once a month from a specialist its worth spending the money.
its hard to reduce your work load as money is a big key in life, but with the money i got from selling work an sold van system, i use the money to invest in something , it give me a ok return and each year its getting better.
working yourself into a early grave ain't good, there is more to life than work work.
i hope you feel better soon.