Your pain seems to be typical dental pain associated with carious tooth . The reason why the filling in your tooth came out might be because of decay developed under the filling that caused filling to get dislodged.
Also antibiotics ,pain killers and salt water gargles will give u only symptomatic relief ,for sometime.
Kindly visit your dentist following protocols regarding covid and get tooth /teeth treated either by filling/Rct /extraction ,whatsoever is option is suitable in your case ,depending upon the clinical conditions and xray of that tooth .
Health Tips
do not apply any hot or cold packs or any kind of balm or clove oil etc for relief, it might worsen ur pain more .