Thanks for the reply Chris. I think this is different because I do expel large amounts of gas. It's true that when I have difficulty burping up the gas it builds up and causes nausea and dizziness. I'm not nervous at all during this fast. If fact I'm very serene and I handle conflicts much better than I normally do.
I hope everything goes well with your alternate day fasting. I had been reading about it the same time you were. I might try it fo awhile if I have problems keeping off the weight until my next fast in the spring.