Had an anaphylactic reaction to a tetanus shot when young; no one wants to give me a shot. is there any way to test whether there really is an issue?

Allergist: An allergy specialist might be able to do this. But maybe not necessary. Tetanus is extremely rare. Although periodic re-immunization is wise, it's optional for most people not at special risk. Discuss the issues and possible referral with your primary care physician.

Tetanus vaccine : allergy is rare, often times ADR (Advese Drug Reaction) is interpreted as an allergy, but true allergic reactions are rare. Agree with Dr H re referral to an allergist for evaluation, a test dose / fractionated dose can be administered or even a challenge with the whole dose under observation, also concur with Dr H as regards the option not to have the vaccine if not at a high risk of exposure