It may - or may not - be possible.
The first thing to do is: tell your boss. There is a very good chance that he is going to find out anyway, and just trying to hide it does not look good.
Second: How old is your most recent backup? If it isn't too old, then this is a good time to practice your companies disaster recovery procedures.
Third: Redgate may be able to help.
http://www.red-gate.com/products/dba/sql-log-rescue/[
^] is only for SQL 2000, but it will give you an idea what to look for.
After that: What were you doing playing with the live server? Silly move at the best of times... When you are up, take a backup, and then do them often!