What do I do?

[Junior Senior]

were you checking to line up a check raise all-in to any pot sized bet? - that cold have worked.  You could have just shoved on the flop but its a huge overbet (not really a problem in itself) but now the c/o has shoved following a bet its a tough one to call all your chips off especially with the BB (who has already shown strength) still to act.  I would be tempted to fold here depending on how much extra you can make by laddering up a few places.  if you are playing to win then its a great spot to take the chip lead and push on.