Burnout badly from my corporate job, don't know how to cope anymore

First, what you're feeling is real and you're not weak for it, burnout is a genuine health issue, not just being lazy. I hit the same wall two years ago, same chest tightness and dread. A few things that helped me, sharing not as expert but as someone who's been there. (1) Talk to someone, please. You can call Talian Kasih 15999 or Befrienders (03-76272929, available 24/7) just to unload, it's free and confidential, and sometimes saying it out loud already lightens it. (2) See a doctor, even a GP, burnout with insomnia and physical symptoms is worth a medical check, they can refer you and an MC for rest is valid, mental health is health. (3) Set one small boundary at work, like actually taking your lunch away from desk, or logging off at a set time twice a week. (4) Longer term, decide if it's the job or the whole path, but don't make the big quit decision while at your lowest. You matter more than the job. Please reach out to a professional or those helplines, you don't have to carry this alone.