Vaccine hangover 

The feeling of ickiness the day after any vaccine. It could be a headache or low fever.

It is caused by your bodies immune response to the vaccine and shows the vaccine is working properly.

I didn't feel anything after the first covid shot, but the booster gave me a vaccine hangover

Vaccine hangover by Wordiculous September 30, 2022

vaccine hangover 

The side effects experienced after a covid vaccine.

Dude! This vaccine hangover has me feeling like I just got off a weekend drinking bender.

vaccine hangover by Orbinator April 15, 2021