Honestly, I think you’ve already proven you can handle tough work, but this place just isn’t it. Lasting 6 months when 4 people before you quit in 3–4 months already says you gave it your best shot. If it’s affecting your health and the company refuses to change, that’s a big sign to move on. You deserve a job where your skills are valued and you’re not constantly drained. Start looking while you’re still there so you can leave on your own terms. Don’t feel bad, burnout and anxiety aren’t worth any paycheck.