If in fact you do get a Comirnaty shot, which wont happen for years, and you have adverse effects, you can sue Pfizer. but that’s why it’s not available.
This is where Pfizer's legal scheme gets complicated.
The USA is currently under a National Health Emergency.
According to the Emergency rules, no drug or device combating the Emergency is liable while the Emergency is in force.
The Emergency has been extended several times. The rules do not explicitly say that FDA approved drugs cannot be sued, but the language also does not say they can be sued.
Several court cases, in regard to mandatory vaccination, have been brought claiming that the current situation in the USA does not meet the standards of a Health Emergency.