Mr Malty Pitching Rate Calculator
plug your numbers in this calculator. This will give you a good idea on how much yeast you should use.
That doesn't necessarily explain why you are at 1.022.
edit: to answer your question directly....you should bring your fermenter up to room temps and give it a good swirl. If you see no activity in a couple of days and no change in gravity I would pitch another pack of notty.