Find out from your doctor
why she wants you on it. Black walnut
hulls are usually what they want you using for parasites - there are prescript
ions that you can get that will work.
My step daughter's youngest son has severe food allergies as well - and one of them is tree nuts - so I understand where you are coming from. Stand your ground about
not allowing it in your house for your son's safety - but do find alternatives for it!
I use wormwood (artemesia) in my Lyme herbs and that's supposed to be for parasites.
You might find this article helpful for ideas:
altmedicine.about.com/cs/conditionsitoq/a/Parasites.htm