I had a case of hay fever , and did an emergency flush couple of months ago ( My flush #4) I think. The flush really helped with my symptoms.
So you may want to continue with your flush.
I always lie on my back. Some flushes, I have slept ok. others, I had a horrible night.( vomiting/butt-pee/nausea). But the end results are so amazing that I will keep doing the flushes.