You can never be able to do all alone by yourself because you will find it very difficult to cope with yourself depression and the demands those kids would need from you. You need your partner to help out in one way or another, otherwise its
It's going to be very difficult for you.
Nothing is ever easy when you're depressed. You lose fun in just about everything. I can only imagine how frustrating it's going to be for you waking up everyday and prepare for work. If it's is possible, take some time off work and get some treatment.