Andy's return to tweets and Facebook so soon after the match suggests he is not at all devastated by the way he'd lost. It even implies he tanked the match against Federer. Winning against Raonic was important to him because of H2H and also, he has gained 200 points out of it. Against Nishikori, the H2H is in Andy's favour though could have used 200 points there too.
I said this before (probably at the AO 2015 thread) that this WTF wasn't that important to him to begin with, as he was just working on his ranking for 2015 AO, so that he can be seeded within the top 8 bracket.
He needs to realize though that he has yet to beat anyone this year who's ahead of him in the ranking - be it Nishikori, Wawrinka, Nadal, Federer or Nole. So certainly a big task ahead in the coming year among other things.