What the hell do I do?

I'm on a 6 game lose streak, and went from almost into promos for Silver 1 to now almost into demotion to silver 4 (S2 81LP --> S3 18 LP) I simply cannot win any game. I just lost a 5v4 (Yes, they had 4) where at one point I was even legendary. No matter what I do it seems that I'm always at the disadvantage. Before you say l2carry, I already climbed out of bronze 3 and surged towards silver 2, and used to be gold, but I suddenly had one loss and now they are stacking up and to be honest I don't know why. I have tried taking huge breaks, not thinking about, nothing is working. Advice?
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