Lots of good advice here. I was in a similar position a few years back, but was able to make it to a career I actually enjoy, so wanted to share in case it's helpful to to have a been-there, life-got-better example.
I was miserable at work, had gone through several jobs and had what I felt was a dead-end college degree. No direction or career goals really, and felt like any where else I would go out would be the same. My hobbies and friends were really the only thing that kept me from genuinely getting suicidal for a while. Looking back on it, good counseling or antidepressants would have been extremely helpful, but I knew enough people who had bad experiences that I was a little terrified of anything counseling-related.
Two things that did help me figure things out:
1. making separate lists of things that I am good at (eg. being obscenely organized, cooking), am bad at (math, keeping a straight face), like doing (helping people, reading books) and don't like (math, anything customer service). then looked for overlapping things that I like doing, am good at, and could be work-related. I also made a completely different list of what I wanted out of a job ($ to live off of and save, enough vacation time to enjoy life, flexibility in location, etc.) Used these to reevaluate what kind of jobs I thought I wanted.
2. volunteered at random places on the weekends to give myself some sense of meaning and purpose, and to try things out. Spent some time at a wildlife rescue and learned that wood ducks are adorable, baby bunnies are precious and fragile, and that I do not belong in any work environment like a vet or hospital because I hate it when things are in pain/die in front of me. Spent some time tutoring ESL at a library and learned that I love teaching, language/culture, and helping people, enough so that I went back to school for it and now teach ESL full time at a school in a super-diverse area.
Going back to school for a major career change may not have been the most mustachian decision (had to take out some student loans) but I am SO much happier now. It isn't all perfect roses and fun, but I could happily work at me current job until I retire, even if that's not as soon as it might be with a higher paying job. A few years ago I thought that was impossible.
I hope that you're able to find some good help, and good luck working through this. Just recognizing that you want things to change is at least a first step.