We are exposed to an incalculable number of substances each day, both natural and produced. It's impossible to say one thing caused one thing. Many of the chemicals in our food have been outlawed for years in European and Canadian foods. It's not just food dyes, it's preservatives and things to address texture and taste. The sun blocks, lotions, shampoos and deodorants we use. Tons of science and hooey out there. I've started using the Yuka app and I've had some pretty big surprises on some foods I'd taken for granted were "clean". Kirklands canned chicken uses an extra preservative, Sam's (Members Mark) does not, for example. A fragrance free lotion (that's got to be good, right?) Cerave has some nasty substances in it. I recommend the Yuka app. Be educated, then make your choices, but an uneducated choice is no way to go - unless you're Forrest Gump.
That being said, I do believe there were clear instances of reactions to the COVID vaccine. You can't give anything - peanuts, beef, bread - to 75 percent of the U.S. population and not have some allergic reactions. It was a rush job to address mounting deaths. Where there is an imperative, you move. 15,000 airmen alone died in training accidents in WW2.