hey juliana,
afraid i dont really have any advice for you but i can sympathise. i function as far as my studies are concerned (though often that is a struggle) but my flat is invariably a mess, i cant do my dishes, i often dont hoover for ages, i sometimes find myself staying up til all hours even though im exhausted and i know im going to pay for it the next day. in short my home life is a mess.
for me i relate it to the mess in my head trying to work everything out and also to a huge extent to my anxiety. i look at doing one thing and get overwhelmed at the hopelessness of starting because i can never get control of all the stuff that seems to out of control. when my anxiety is particularly high about something (like at the moment) it makes me instinctively want to hide away and shirk all responsibilities. the only ones i can really afford to shirk though are the dishes, home stuff etc. if i avoid any others like my studies there will be severe consequences.
i hope some of this made sense and/or was of help in at least letting you know you re definately not the only one struggling with this!
good luck and take care
biiv