Yep, that does indeed explain the white cells. I've actually got some pau d'arco tea, so I'll go boil some up now. I stopped by the health food store just to see what they recommended, and I came away with cranberry extract and echinacea so I'm taking those too (I take it they're safe to take with the pau d'arco?)
I've been wanting to look into getting an ozonator for a while now but funds are a bit low - are they expensive? Anyway thanks a million for your reply :)