https://www.forbes.com/sites/andrewbender/2013/05/03/five-ways-tequila-is-good-for-you/#4e3b47d47fd6
What brand Tequila?
In any distillation process there are trace amounts of alcohols that are not good for the body. The more expensive products tend to have less of the offensive.
Best to pop aspirin if your body can take it to help prevent a hangover. Another great trick is to find someone with a divers mask and oxygen tank. Oxygen quickly dispatches hangovers.