If you can really put 70 - 90h a week, at someone elses job, hats off to that. You have some stamina. If I were you I'd switch jobs ASAP to something like a reg

If you can really put 70 - 90h a week, at someone elses job, hats off to that. You have some stamina. If I were you I'd switch jobs ASAP to something like a regular 40h/week, then maybe spend the other 20h/week working on a side project, something that you could be passionate about, maybe try it with a new programming language, or something that you don't do at day job like game development. You could never really try it with a job that is so time consuming. Take the remaining time to rest and chill. Your brain fog is probably a result of being overworked and too little sleep, and spending too much in your head when working. You can also try zen meditation against brain fog, it directly fights is symptoms as it forces you to step away from the stream of random thoughts and focus on your body and surroundings. "3 Pillars of Zen" - is a good introduction, don't need to take the entire book seriously, there are good instructions for practice.