I'd recommend talking to a therapist about this possibly being depression. Also talk to a physician. A lot of people get into a self defeating cycle of wanting

I'd recommend talking to a therapist about this possibly being depression. Also talk to a physician. A lot of people get into a self defeating cycle of wanting to do X -> being unable to start X -> feeling bad about not being able to do X -> doing Y to feel better about not doing X. It's weird but the effort to try and motivate yourself to do something, even if you are unsuccessful, is still draining, and like someone trying to keep running after their muscles have given out, if you keep trying to push your mind when it is in need of real rest you're never going to get back up to full strength. You need to break out of the cycle. Change up your habits. Stop getting high, stop playing videogames, stop working on your game, stop doing or trying to do anything that your mind knows how much dopamine you're going to get. Try doing some things you've never tried before, that you haven't even thought to try before. Change up your scenery a bit - start going to new restaurants and places. If financially possible, get an airbnb in another city for a little while. Your brain basically needs to relearn how to have a good time. Start out with extremely low commitment stuff so you don't get yourself down when you fail, and as time goes on you can take on more involved things. Also, invest in your support network. Find someone who can give you the little extra push when you need it to start things, and hold you accountable when you don't meet your goals without being harsh. They should expose you to new things and help you avoid feelings of loneliness. Finally, beyond just shaking things up, you may need to make some real life changes. Depression is our body's way of telling us that we are in need of deep introspection - something in your life is wrong but there isn't some simple pain receptor to activate. Perhaps the new job just isn't for you, maybe you are in need of a feeling of success in something important to you like game development, maybe it's something non-obvious like a health issue. In my case, I spent a decade constantly feeling mentally and physically exhausted and no amount of sleep or rest would rejuvenate me - turned out it was undiagnosed sleep apnea and I basically just hadn't gotten a proper night's sleep in years. While there are many things that can help cheer you up and accomplish your goals in spite of the depression, you won't be able to truly recover until you find and address the root cause.