Where Did I go Wrong

Whatever happened to me? I was there sitting at an 87% winrate on good old fashioned attack speed/crit miss fortune after 30 games, but now I can't for the life of me win a single game. I currently have 2 wins in my past 20 games, and I am running out of options. I stopped winning with MF so i decided to try a few of my other mains from a month or so ago and I cannot get a win with those either (Ryze, Evelynn, Taric, even Poppy). I would like to know what my next step should be or advice on how to get back on track. I think this loss streak might have started when I first picked up HOTS which has a very different time to kill which might have affected my gameplay if this is useful.