[throwawaystale]

Sorry you're having a bad time. I'm old, but can still relate.

On the codebase, yes, most are horrible, unfortunately. Try to think of it as your opportunity. If you can learn to comprehend and fix code like this, you'll always be in demand, because these messes will never end.

Try to enable more logging and debug info as best as you can, and learn to use the tools available for this.

If you're getting positive feedback, that's good. Most jobs offer little or no feedback until things go bad.

As for weight, you should let yourself up. Nobody who matters cares, and it really doesn't matter in the big scheme of things. You might find intermittent fasting interesting.

Might be useful to find someone to talk to.

Good luck.