Are you connecting your vaccination to your strange response to coffee? Or are you being facetious?
It's hard to conclude much of anything when the sample size is one, and the only clue is timing; there being no other known basis for the connection. As of last February 11th the U.S. had ordered or purchased 141 million doses of Moderna Covid Vaccine. (The total U.S. commitment at that time was 300 million doses.) Of those first 141 million doses, some fraction of the doses would have certainly not found arms and would have been discarded -- assume 10%, that produces roughly 126,900,000/2 fully Moderna vaccinated "guinea pigs". Assuming yours is the only report; the incidence of the coffee-Moderna side-effect is 1/63,450,000 = 0.000000016%. Not sure this will be scary enough to keep folks away from Moderna.