First off, its probably a toxic work environment, and second, you're at a stage where the walls are closing in so it feels worse than it is. Programming is inherently a creative art with a core of logic and reason. For example, you can solve your business case by writing shell scripts instead of Java. By toxic environment, I mean that there are things at work that contribute, such as the way your coworkers talk to you. One such example is that there is one guy who is the go-to guy for all problems relating to X, and he solves this while telling everyone all about it, all the time. This makes it seem like he is the only one who can do it properly, which is of course never true.

Your financial security is just a product of the times. It used to be you could have a house, a lawn, a car and leftover savings just from working in a factory. Now, you are saddled with an unpayable house-loan even with higher education unless you somehow manage to find a remote job, or you win the startup lottery.

Last, anxiety can form bad feedback loops, where the lack of sleep means you are simply not able to do anything during the day. It can also cause other surprising problems, even wrist pains and RSI, simply because the anxiety causes your body to tense up.

I think you, first of all, need to find a way to let go of the feeling that your job performance has any bearing on your worth as a human being. It really doesn't.