You’re experiencing burnout. Rest up enough to improve your mental state, not finding joy in previous hobbies is a telltale sign. Try something that requires less critical focal or lets you take reprieve from your day to day schedule; vegging out, going for a walk, casual talk with friends, get counseling if you feel you need it, etc. The system will bleed everyone dry and leave them to rot if you let it. Take that time back and invest it in yourself.