Just to add a more optimistic note here: I had a severe suicidal depression a couple of years ago, and managed to completely recover from it by learning something new, which is one of the things that always lifts my spirits: web development. I am now in the process of starting my first startup and feel very happy about my life.
(I took antidepressants btw, don't be scared to take pills - they very often help and am convinced they made a difference for me)
So, if you are feeling depressed and learning new things tends to get you excited, consider dropping everything that is bringing you down (I started ignoring my job pretty much and got fired eventually, but it saved my life so I have no regrets), consider learning something new!
(I took antidepressants btw, don't be scared to take pills - they very often help and am convinced they made a difference for me)
So, if you are feeling depressed and learning new things tends to get you excited, consider dropping everything that is bringing you down (I started ignoring my job pretty much and got fired eventually, but it saved my life so I have no regrets), consider learning something new!