Do you have any wildlife rehabilitation groups near you, guarddiva3? I don't know about squirrels, but in gerbils or hamsters that clicking noise usually means pneumonia.
There is a National Wildlife Rehabilitators Assn that can get you in touch with a group in your area that has experience with squirrels. The office is only staffed in the mornings as I recall, but you can leave a message for them at any time: (320) 230–9920 Not sure how often someone is there to check it, but there is also a contact email: NWRA@nwrawildlife.org
I recently called them about a groundhog and they were very accommodating. They returned my call very quickly.
Good luck! And keep us posted, pls!