This is kind of an example of why relying on personal experience and anecdotes is so bad. OP took intelligent countermeasures to avoid a negative outcome which was unfortunately ineffectual due to mischance.

Despite the theory making no sense OP assigned the consequences of covid to the vaccination he received not due to a sound theory but due to proximity in time and will now make measurably worse choices for decades for lack of communicating with a medical professional.

We rarely know what we don't know.

Some degree of caution is warranted on the part of the individual when unwelcome side effects manifest following a drug or vaccine. Doubly so when you can find cases where others have reported the same side effects.

https://www.reddit.com/r/CovidVaccinated/comments/nnqm8u/lon...

We are also dealing with a novel (and evolving) virus and an even more novel set of vaccines. We're still learning about both. I find it silly that one could possess hubris about their stance on such a matter.

What's your sound theory (that it's the result of Covid and not a vaccine with documented side effects that he happened to take the morning of)?