Hi franz
It sounds like things must get/be real tough on you with the depression alongside everything you need to manage

To me taking lots of extra time and taking lots of breaks sound like great strategies.........but some more.......just a few thoughts:
Maybe prioritise the most important things you need to take care of and focus on them.........and where you can, as you're completing them add what you can on..........making your goals/expectations of yourself as realistic as possible...........
Maybe setting yourself a routine (if you haven't already got one) could help...........I know it may be easy to put off/delay things..........but maybe if you build them into a routine.........
Maybe break down tasks into smaller steps so as they don't seem so overwhelming.........
Maybe see if their are any responsibilities you don't have to be as responsible for...........perhaps you could limit them a little or even have someone help if possible..........
Maybe you could make more use of those breaks and do something that may work better for you e.g. something relaxing/something to try to take your mind off everything else you have on/something that may make you feel a little "good"...........perhaps try to make those breaks real "you" time.............
Absolutely "stand back" and give yourself real credit for things you achieve as you complete them...........
If you're a student maybe there's a college counsellor or a tutor you could talk to and get a little help from.............about course work
or the way you're feeling??
And if studying is difficult..........maybe there are ways/methods you could change the way you do that a little?? e.g. where/when/how...........you study??
So just a few thoughts.............
Hoping as well that your depression passes soon.
Alison