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This is not normal.
Though this is not a known complication of nerve ablation surgery but ta times unexpected complications can happen.It would be safer to have your seen by your doctor.
In case of an allergic reaction benadryl should have helped.So allergy is less likely.
Still we do not know exactly what is happening.If you are otherwise fine you may wait to see your GP , if you feel that your condition is getting worse at anytime it would be safer to go to ER.
Hope you are better now.Best of luck.