You're only behind 6 of those combos right now (3 each of JJ and 99), if Villain has one of those, it's a cooler and you're basically drawing dead.
Since you have 5s, there is 1 less spade to draw for the flush.
You're basically a coin flip against QTss and T8ss (14 outs) @ 51:49 against.
Against KQss, Q8ss, and 87ss (11 outs) you're a 58:42 favorite.
Against any other pocket, you're at least a 2:1 favorite.
I.e. against any other flush or OESD (8 outs), you're a 68:32 favorite.
What d0zer said.