There are so many people that this has happened too, it really is so sad and I think its too much of a coincidence that in the majority of cases they are within days/weeks of vaccinations.
There is not even any real proof that vaccines have eradicated diseases, studies show that cerain diseases were already in decline due to better sanitation and healthcare when the vaccines were introduced. In fact in some cases, such as with polio, rates of the disease actually went up when the vaccine was introduced. Also, many outbreaks of diseases occur in people who have supposed to been vaccinated against them.
I do think it is a personal decision to be made, but it should be an informed one - too many people only listen to their doctor/nurse and do not look at both sides of the argument before vaccinating.

I certainly won't be vaccinating my baby, I think nature did very well designing our amazing bodies and do not believe it should be messed with unless absolutely critical.