i too have suffered from depression, not severely, but enough to affect my life and family.
So i sat down and took a long hard look at myself, and was very critical. i worked out what made me happy and what made me unhappy.
i made alot of changes, some quite drastic, changed jobs a few times, until i found one i loved and now i think i can say that i am happy.
i still get the odd few days that i am down, but generally life is much, much better.
you have seen the person you are capable of being and you liked it, that is you being like that, not her, so you can be that person again.
She is now one of those things to be written in the making you unhappy column.
you are strong enough to talk about your problems, so you are definitely strong enough to come through this, and come out the other side even stronger
GOOD LUCK