Gratitude isn't something that gives you power to be happy and shiny and on top of the world in any situation.
Gratitude is reaching a state of such humbleness that you realize that, no matter in what situation you are, be it comfortable or terrible, you have so much to thank for that you apreciate the value of even the smallest thing; and that makes you happy with whatever you have, because you realize that, no matter how little you thought you had, it's worth so much.

Therefore, real gratitute is not a thing that gives you the power of turning a bad situation into a good one; it's reaching a state of such humbleness that you realize the good things were never far from you to begin with.