You need a TD. You go for it and get it and you fight on. If you don't convert, yes you hand the ball over to GB at your 35. Your D has a smaller field to defend and you are more likely to get a stop.
You get a stop. Crosby kicks a FG. You get the ball back, which keeps you in the game and you march down the field to give yourself a chance to tie and take it to OT.