I know of many people who did not do well on either oregano and vco.

I on the other hand did fine on both. I started gradually and got up to about 10tbs of vco with no problems and no die off. Oregano I use to put 6-8 drops of the P73 under my tongue 3 times a day to kill my sinus infections and a good job it did, but never get die off with it anymore.
hth
Everyone seems to be different when it comes to this kind of thing