To make an assessment of safety, what is the number of people who have taken them and got significant problems? It is very hard to find this number. I know a

To make an assessment of safety, what is the number of people who have taken them and got significant problems? It is very hard to find this number. I know a person who got bad reaction to the vaccine, heart and brain aches. Their doctor turned them down, saying "that's normal, that's what vaccine does" a didn't even do ECG. How many people got treated this way?