I'm not much help since my DD is only 13 weeks, but we too have chosen not to vaccinate (yet, anyway) and I've never even thought of the things you mentioned as being risky!

That might just be me being uninformed though... if I need informing, please do!
Also I figure it's better to "regret" not vaccinating than to regret vaccinating - at least you can start vaccinations at any age, but you can't undo a vaccination once it's done!