QQ reraised and called

[betgo]

$1500 live MTT, original stacks 7K. Blinds 50/100. I have about 6K, 5th position has about 4K, and BB has about 14K. 5th position is young with shades; he limp/called Ax and appears to be a donk. BB is black with shades; he raised 86s from CO, called a reraise, and bet small when he made a flush on turn; seems like OK player. I raise to 300 in 2nd position with QQ, 5th poaition reraises to 800, and BB cold calls. What do I do?