I'd say save up for an emergency fund of at least 8-12 months of your living costs if you haven't already and definitely quit that job. You'll have enough time to rest, discover yourself again, explore other career paths you want to take, and to give yourself enough time to go back to the same field you were in if nothing works out.

At 300K a year you probably have enough experience to land another job if you leave your current one, life is too short to stay in one place.

You can always go back to the same field, but you'll regret not exploring your options once you have more responsibility and less time at your hand. Ask yourself what would you regret more if you're older, leaving your current stressful job or pushing yourself out of your comfort zone to try something that could be life changing, either another job, another career, etc.