I'm glad your doctor emailed back with reassuring news about your "baby"
(my oldest "baby" hit legal drinking age this year, and when she gets dental implants put in this August to replace genetically missing teeth, I know I'm going to feel VERY protective--can't even imagine having had to go through an AN with her, as you have...)
I sympathize with your wariness of MRIs (not to mention detesting the experience of getting them!), but everything we know at this time points to them being safe. Considering how expensive they are, after all, they pretty much need to be low- or no-risk for doctors to justify relying on them...
Good luck to Eric--I hope he'll be much more comfort once those wisdom teeth are out!