Ok...
I hadn't synced my iPhone 5s with the new download so nothing was lost from my iPhone playlists
The fix was pretty easy. Go to your iTunes folder in Windows.
Go to Previous Libraries within the iTunes folder, then go to the date that you downloaded the new iTunes 12.2 update.
Drag that library to the main iTunes folder and rename it 'iTunes Library'
Rename the current library, something else other than iTunes Library.
Everything was then as it was before the update, library, playlists etc.
Thanks for all your help.