To be sincere I haven't read
Nietzsche that much...I'm kind of young and it's books are kind of pessimistic...and I don't feel like living any more after a Nietzsche reading session. However his brilliant thinking is forever impressing me.
In this case
Nietzsche tries to explain that if you sink into a state of depression:
"Get Strong !", otherwise you risk to never get out of the crisis and never see the opaque glim of happiness again.