That does sound pretty bad, but it is quite opposite to my own experience. Personally, it made my arm sore at the site and I felt a little tired later that night, but I am not sure it wasn't normal fatigue.

Moreover, at this point, almost everyone I know well has been vaccinated (to the point that I don't know of anyone I have interacted with in the past year and have met in person that isn't vaccinated). Of those people, the worst report I've heard is feeling bad for three days or less (two described a milder version of flu-like aches, fatigue, etc upon receiving their second shot).

As an exercise, I made a list of those people I could think of that I've spoken to in person or on the phone about their response to their vaccination and that came to about 40 people before I stopped trying to think of names. And while I cannot be sure, I also believe that they would have reported at that time any severe effects on their close contacts (who also almost universally got vaccinated if they were eligible).