It's possible your bloating and nausea are due to candida. I'm treating candida overgrowth, though, for me, oil pulling does not effect it one way or the other, though it has to be helping with the toxins created by candida.
I also experienced a lot of mucous production when I began OP. This lasted for about a month. I, too, took it as a cleansing sign.
I don't really know about the dizziness or loss of appetite.