If you still have your old wallet.dat file inside of your encrypted image, you should be able to get back your coins.
Are you sure the symlink is correct. It sounds to me that bitcoin created a new wallet.dat file, possibly because it could not find the old one.
THANKS for being the voice of reason!!!!
YES, that was more or less the case. The thing that happened is, and do not ask me why or how, that the bitcoin app had created a whole new Bitcoin folder OVER my original Bitcoin folder!
In other words, I had previously my original Bitcoin folder in "/Volumes/Bitcoin" and therefore my wallet.dat in "/Volumes/Bitcoin/wallet.dat".
But then somehow it became just "/Volumes" and my wallet.dat was "/Volumes/wallet.dat" with all the other files normally included in the Bitcoin folder... plus my old original Bitcoin folder (with my original wallet.dat :-D)!
And yesterday night I guess I was so stressed out over what I thought would be the sure lost of my 25 Bitcoins (that I had just bought on MtGox by the way) that I totally missed that.
So now I just put back my original folder in its place and everything is A-OK.
Thanks a LOT for all your help!!!! :-P