It has always been quite simple for me. My mother always used to say this:

There's only one way to get something done; just do it!

You can't blame her she doesn't even know what Nike is and what they produce, lol.

So yes, whenever you're in a funk, and you know you have to get out of it, there's no other way of working it out. Regain all your positive energy and let all the negativity out for that moment at least. Think of all the things you've achieved in life and forget what you lost. That''s where you gain that strength to 'just do it!'.