the placebo pills are just that - placebos. They are sugar pills that are in there to help keep you in the habit of taking your regular pills.
you might feel a bit nauseated when you start taking them again, but your body seems to have adjusted for the most part. Try taking them at night, with some food, and maybe a gravol if your really worried.
You should be fine. In all probability it was just your body getting used to the increase in hormones. I have never had problems with nausea and the pill myself. if the nausea keeps up, you could try switching to a different brand.
~*Jill*~ Teacher, Advanced BSc in Psychology
"You can unlock any door as long as you have the right key". Mrs. Brisby, Secret of Nimh