Tough decision. 50bb isn't really short and your hand isn't really good. On the turn your not calling a $35 bet, your calling a $75 bet. Considering that he called preflop in the sb, he check/called the flop and then led the turn, I'd say he has 2 pair+ (may have hit the second pair, or the straight on the turn.)

It's a tough fold to make (on the turn) but I think you have to. Either decision seems poor, folding with TPGK to a week lead on the turn, or calling off the rest of your stack with the same.

Considering that people tend to play better at higher stakes, I'd (reluctantly) fold on the turn.