@stux
First: good luck. I truly wish you have 0 side effects. (Superpower would be nice aswell)
Second: You do not need to study medicine to consider following. 1) Some of these vaccines are a completelly new type of a vaccine never tried before. 2) Fucked up vaccines did happen in the past, even when they went through a rigorous testing. 3) There were billions of dollars on the line if the vaccines were not released as soon as possible. This means, that it will be inevitably cheaper for the company to "ignore" any negative findings and cross their fingers then repeat the test and wait another 2-6 months.
And finally 4) even if this vaccine is ok, mass vaccination with experimental product is a dangerous precedent that could one day cause mass diseases when they do fuck up one vaccine.