I agree: if we could look these things up before bad things happen, it would help.
Tragedy did strike while I was beginning this: my cousin got an MMR booster for high school and immediately developed a known side effect to the vaccine - her body will no longer produce red blood cells without medical help. This happens more frequently in young children and often resolves itself, but after several years it's become apparent that her case is permanent. She'll be on medication for the rest of her life. That's what sent my aunt down this path much faster and stronger than I was going.