I think you fold. The pre-flop raise shortstacked for 18,000 in first position screams of pocket pair (10s, Js, Qs) and Daniel, being Daniel, has probably put you on one of those hands. Now Daniel is first to act on the flop and he raises you all in. Why would he do this if he knows you have a high pocket pair? I think its because Daniel is looking for your call, hoping you can't get away from your pocket pair shortstacked. Daniel probably has a flush, 2 pair, or a straight flush draw at best for you.The only way you might call here is if you think that Daniel may have put you on overcards