I think Bd6 is the most natural move here. After castling queenside your position should be good. If White takes the g-pawn then it would actually benefit you in the long run. It opens the g-file for your Rook to aim at his king (with tempo). Combine with the Bishop-Queen battery and the Knight at center I think Black would have a great time going for the king. White has no such mean.

I think you should explore the concept of castling Queenside as black a bit more. I know it seems dangerous at first but sometimes it could prove very effective in countering White's attack as well as giving black greater chance at winning. All of this is within reasonable king safety of course.

For what it's worth, I thought your opening was really well played.

thanks... also, i was reading some articles on the caro-cann advance, and it seems that recent thinking agrees with my instinctive assesment that putting the light square Bishop outside the pawn chain may not actually be the best place for it....