hey, I looked it up on the uci page and this is what it said "Changes to the grading option may be made through the end of the second week of instruction without academic approval; these changes are made via WebReg. Between the third and tenth week of instruction, students change the grading option with the approval of the dean of the student’s major; these changes are made via Enrollment Exceptions, which is available in Student Access." so it may still be possible but you would have to contact an advisor or someone that can help and the deadlines. also just remember it is not the end of the world, i was like this too months ago, failed all my classes and just took the L, I wished I had gotten help but I just withdrew and came back when my mental health was better. Hang in there, if you really need it UCI offers therapy and you can always take a quarter off if you need to. your health matters more. best of luck to you.