It felt like my workload was forever increasing. I could never rest on any laurels without falling significantly “behind”. I developed a major substance abuse problem as well (sober 14 months now), although untangling cause and effect here is impossible. I think I was abusing substances in part to cope with the stress.
Sounds very familiar. Also, when I finally put my foot down to demand changes in order to avoid burnout, that was used against me when I was later discussing a pay raise. I learned to never bring up problems again, and got crashed hard.
If I recall, that thread helped me avoid burnout for a while. But it eventually caught up to me again with a ferocity I was unable to defend against, with the catalyst being a parent who died. Fortunately, I was in a position of financial strength and faced the beast head-on. On further reflection... burnout turned out to be a gift in disguise. It was an impetus for necessary change.