Most vaccines contain thimerosal which contain a very "agressive" type of mercury, so its possible that this might have done it to your immune system (cumulative effect).
My suggestion is that you see a biological dentist who is aware of the dangers of Amalgams and root canals and have them properly removed; follow the right protocols to minimize post removal symptoms; be aware that your symptoms might intensify before you start seeing improvements so don't be discouraged.
Mike