Hiya, welcome to the forum.
Everything is raw for you at the moment but it will get better I promise you. Just take each day as it comes and eventually you will find the pain weakens until it’s just a memory.
It sounds as though your ex has some serious issues so it would seem to me that in the long run your going to be better off without him.
As for immunisations I totally agree with you, all the science out there points to them being a good thing, don’t let you ex’s delusions put your little one at risk.
Keep your chin up, your going to be ok.
Mark