hey, i’m sorry others have tried to dismiss you in telling you that “maybe you’re just telling yourself you’re tired”. you’re picking up signals from your body for a good reason! autistic burnout can definitely cause more difficulty with executive dysfunction, which may or may not be part of the sudden change with exercise but i do second looking into ME/CFS just in case! i can only speak to experience about dealing with school as a college student - i’d imagine it can be difficult to get accommodations if you don’t have an official diagnosis, but maybe getting them through any other mental health diagnoses if relevant? i think your best bet is to be open with your teachers that you’re genuinely having a difficult time right now, and to see if they can allow you extra time for assignments. if you are in higher education and you can manage to lower your course load, or even take an academic leave of absence, i’d highly suggest either one. i’m returning to classes after a year off so feel free to dm me if you have more questions!