Lasts night i played in two MTT at ultimatate bet, and got close yet again,took 8th place, busted when i flopped the nuts flush A

board 3 7

anyway ended up with all my chips in and busted to a boat on the river..guy had 77 and the river came a 3
anyway thats not the reason for this post...In another tourney there later I was down to last 26 players in 11th place, It's here that i always run into the most trouble, i was in the BB Q J hearts everyone folded and the SB min raised it, I called to a flop of 5 8 J rainbow SB, throws out a large bet, im thinking he's got AK and this is a steal, so i raise he calls and the turn is a rag 3 i think, now half my chip's are in, and he put's me all in how do you get away from this hand now?