dxc6

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I now have several options. Whatever you do, you're shortly going to be down a bishop. 17. ... Bxc6 or 17. ... Be6 or Bg4 will be followed by Qxd6, which would threaten 18. ... Rd1 and force your Queen to retreat, potentially exchanging. Moving your black bishop would obviously be disastrous and lead to mate in two -- I suggest you don't do that. 17. ... bxc6 is an option, still losing you a bishop but opening up that file for your rook. It would force you to castle kingside fairly shortly, as again Rd1 is a clear danger. If Qxd6 is followed by Nd5, you'd be in serious trouble.