Two things to do:
1. Ask your boss to ask the IT guy to reset it again. There are third-party programs that claim they can do it.
2. Ask your boss to ask the IT guy to take measures to prevent that somebody or something resets it without your consent.
Note: all answers with links or recommendations for such third-party programs will be deleted as advertising.
I have unpleasant problem. My outlook .pst password was reset. Now I can't enter to my Inbox Folder on Outlook. I have to do it in couple of days. Otherwise, my boss will spoil my career, I hope, someone suggest something...