You should contact your dentist immediately. Most dentists will schedule your appointment within a two days of your call, you should not wait more than a week.
You should contact your dentist immediately. The filling is to protect the exposed nerves, and now those nerves are exposed and vulnerable again. Get a new filling as soon as you can.
There is nothing much to worry if you lose a temporary dental filling. One can wait for any time period for refilling the same untill it starts aching.