Hopefully you can pull your data off that hard drive and quick, Ive seen clicking hard drives in the help desk head crash anywhere from 1 hour to a couple of months after the clicking. Otherwise data recovery might cost a fortune if it is imperative data to you, something upwards of 5000$ to start off. Although if it can no longer recognize a partition and you want to pull stuff off before it head crashes, i recommend a couple of programs.
Diskgenious is one that i use that recovers lost partitions and data which is nice if the partition tables get corrupt and you can no longer see that partition.
HDat2 is one that i use if the hard drive is beginning to have corruption because this fixes the corrupted bits and replaces them with 0's which wipes the data but allows you to use the hard disk.
Vvard which is similar to Hdat2 except that it pulls good uncorrupted sectors and replaces the bad sectors with the good sectors, this is better if you dont want to loose some data because instead of fixing the problem with 0's and loosing data you just loose some freespace.
Diskdigger recovers files from a partition that is no longer readable and i have used this program with huge success. Just remember if you can recover data using this program, nothing will have a file name attached to it because of the parition tables being gone.
Hope these programs help and good luck.