I also had a normal job + an hourly gig in the evenings + studying for a master degree. I'm not exactly sure what changed but I stopped caring about that race of needing to be productive 100% of the time. It's a fallacy, I think at some point I realised I'll be alright even if I lose everything, I just need food and shelter and I should be able to afford that in most scenarios. I think it had an ego component as well, at least for me, it was about being "successful" as external validation. As I matured I felt naturally more confortable with my situation and it passed ... I hope it will for you as well.

As for the feeling of doom, my only recomendation is to step back from the news and the constant bombardment of "bad things". No need to become a hermit, but come back from the world stage and look at your neighbourhood, maybe read local news instead and reconect to your actual surroundings. Reading and talking about the new park they're opening next door instead of what's going on miles away has helped me a bit.