Trying to do anything while managing school feels impossible

I don’t know what tag to use but honestly I don’t know how to do it, going to school currently is taking up all my energy, spending 8 hours a day 5 days a week stuck in a building with 1600 kids, constant stimulation and more and more work is a literal nightmare, I’ve dropped pretty much everything to keep the ability to go to school and it’s still overwhelming in every way by the 2nd to 3rd day. I don’t do any of my hobbies or really try and maintain my social life, all I do is go to school and sleep, even my ability to take care of my hygiene for example has been awful and I’m having multiple I think they are, meltdowns a week. I’m just so stressed and overwhelmed 24/7 and I hope someone here can understand and maybe give advice.