I don't really have any words of wisdom really but just wanted to sympathise with the situation you are in as I have been through it myself.
My sister was left permanently brain damaged following WC vaccination. I was vaccinated but had WC twice as a child.
As a young adult I was told I must never vaccinate any children I subsequently had as 'we don't know exactly what went wrong with your sister'. Plus certain vaccines were contraindicated if there was family history of adverse reaction or seizures.
Fast forward to when I did have my DCs and the advice was all changed and I was told there was no risk, even told that perhaps my parents had imagined the whole thing and that my sister was born 'like that' and they just didn't notice. .
Anyway, my DCs are unvaccinated, a decision that was not taken lightly.
Our GP has been lovely and understanding.
I did breastfeed my DCs for an extended time in the hope that that would offer them a little protection. I also just made sure that I knew what symptoms, especially early symptoms to look out for. They haven't had any illnesses other than chickenpox and i haven't restricted their interactions in anyway.
It's still hard but I just can't shift the fear I have. It would kill me if history repeated itself and equally it would kill me if they became damaged by vaccine preventable diseases.
I just hope. They are now 5 and 10 so they've outgrown the need for most vaccinations but their being unvaccinated is temporary. My eldest will be vaccinated sometime in the next 18 months.
Good luck.