Your topology looks like this
Or is it
Modem > wireless router
and you're correct 2.4 & 5.0 GHz does not cause any health issues. If it did it wouldn't be everywhere. I'm sure that you can pickup your neighbors wireless signal from your house. You could build the case that its the exact same thing.
I'm sorry I'm trying to get your exact topology just to make sure i can help you with your issue.