I have been really nauseous, but I was all out of phenergan, which is what I normally take when I feel like this. I had something important I had to go to and I took two zofran I had around 7:00 pm. I got my phenergan, and I took one eight hours later. Now, I feel really dizzy and breathless and I have a head ache. Do they react with each other? I thought the zofran would have worn off since I can take it every four hours?