As far as your symptoms are concerned it only points towards dental caries in a tooth or teeth, first and most important thing is to get it diagnosed by your dentist and please don't delay it.
"A STITCH IN TIME SAVES NINE" if it's a filling it can become rct if delayed and if it is a rct than either the tooth can get damaged to the point beyond restoration or nearby teeth can get involved by food accumulation at that site.
Next Steps
visit your dentist
Health Tips
avoid eating from that side,,for temporary relief take an analgesic and get it treated ASAP