Certainly have.Saliva gland stones are quite common and if big enough can completely block the gland causing pain and swelling on the affected side.
Without wanting to worry you though i find his opinion a little cavalier in view of your diagnosis,and i have to tell you that Robs GP thought his neck swelling was a saliva gland stone,which of course it wasn't .
My advice would be to not leave things for more than a few days if there is no improvement,go to your doctor and get it thoroughly checked out,as i dont see how he can be certain without an x-ray at the very least.
Please dont think i am trying to alarm you i am just advising you to be cautious.
love liz