Tightness in chest & throat/rapid heart after dental freezing and eye dilation drops.possible allergy/to what? dentist said reaction to epinephrine?

Epi most likely: Many dental anesthetics contain epinephrine (adrenaline ) to prolong the effect of the drug. Some people are sensitive to this and if that's the case with you , let your dentist know as local anesthetic is available with other or even no vasoconstrictor. Discuss the pros and cons with the dentist and you can arrive at a good understanding and clinical outcome.

Injection Anxiety: Patients receiving dental infiltration anesthesia generally experience anxiety related to the injection. It may feel like your heart is racing, profuse perspiration, pressure, or tightening in your chest; pain in your arms, neck, chest, jaw. Not uncommon.