Welcome to our forum
I was in dentistry for 37 years and I still remember dental issues.
Your tooth that had work done to it....did your doctor place a white temporary filling in it to see if it would calm down by using the oil of gloves in the medicine of the filling. If he didnt did he place a pulp cap over your pulp to try to quiet it down?
If you have an infection in a tooth like an abcess that would firm on the tip of the root of the tooth that infection could make you feel lousy.
I say contact your dentist you may need an antibiotic.
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Nice meeting you