Prior to receiving the Tetanus shot, were you using a foot spray to treat the fungal infection? If so, did the spray contain Formaldehyde?
Tetanus and Diphtheria Toxoids Adsorbed is preserved with Aluminum phosphate, Thimerosal and Formaldehyde.
Tuberculin purified protein derivative is preserved with Tween 80 and Phenol.
People who are allergic to Formaldehyde should avoid Phenol, if you are allergic to Formaldehyde you should not have any vaccines. Your dermatologist can test you for a Formaldehyde allergy.
Below are links on the tetanus vaccine, tuberculin testing and formaldehyde allergy