burnout?

i'm a second year uni student, diagnosed in july. barely two weeks into the semester and everything already seems so much harder, i'm struggling with doing my classwork (though i also am taking two online classes and 18 total credits which. probably was a mistake). i was never that much of a social butterfly but over the course of the last year i've been withdrawing and i've started ghosting my only real friend (i'm gonna try to fix this but i don't even know where i even start without either risking concern or hurt feelings or maybe even both)

i don't know what the hell's going on with me (though i have my suspicions) but it's like. such a huge difference from last year and even last semester when i wasn't this dysfunctional until closer to the end. i almost feel like i'm losing it a little lol