my job makes me exhausted

i know this isnt new here but i dont know anyone else who understands. i found out earlier this month that im autistic. i started a new job last month, after wanting one for a few months, and since then my energy levels have completely plummetted. ive never slept in past 11am, and now i’m struggling to get up at 3pm. im frequently having melt downs. i only work 20 hours a week, and even that is too much.
i requested off two days this week so i could rest, and i got scheduled anyways because someone else requested off after me, who had been working there longer. so i called in and said i couldnt go and i had so much stress about it. im dreading going in friday.

if i sit down i fall asleep. im so exhausted, and i dont have time or energy to do any hobbies because i need to sleep all the time. we had a week off for july 4th, and i slowly was able to feel normal again, and now im back to sleeping all the time. what sucks is school starts again in less than a month and i dont feel like ive been able to rest at all. im trying to lessen the amount of loans i take out by working but i dont know if thats sustainable, my grades have already started dropping. my family will put me down if i quit or dont work. i dont want them to say im lazy or something but i literally cant do anything but work and sleep and im close to losing it. my dad will compare me to everyone else and say that since others can do it i should be able to.

i am currently looking for another job, and i have an interview tomorrow for one on campus - as an office assistant, but its only 10 hours a week. the campus library is also hiring but requires a cover letter, and i have tried to write one but i am so tired i cant even focus and my nervous system is so shot that im freaking out about it, and havent finished it yet.
i dont know. im just so tired. i dont feel like im allowed to make it easier on myself though i know thats unfair to myself. i cant stop comparing myself and im losing hope. im so exhauted my body hurts all the time. i keep snapping at people. i get upset over everything.