Didn't want to read and run... If you're getting negatives I really don't know. But I've had bouts of feeling nauseous before and it's not been pg-related. It's usually gone away on its own after 3-4 days. To be fair, in my case I think it's been when I've not been eating very healthily! :)
How many days and does it get better/worse if you do/don't eat? Oh, and being sleep-deprived can do it to me too, are you well overall?