It's really hard to say whether the Paxil (an SSRI) will have any effect on your nauesa. Sometimes tricyclic antidepressants (like Elavil) and benzodiazapenes (like Ativan) are prescribed for chronic nausea, but I haven't heard of an SSRI being used. Doesn't mean it's not worth a try, though...chronic nausea must be totally miserable. I'd try anything if I had it.
I assume you've had routine bloodwork done? Was anything at all abnormal on your bloodwork? Have you had your liver and pancreatic enzymes checked? One thing you might want to ask about is gastroparesis, which is delayed emptying of the stomach. This can account for chronic nausea and can be detected with a gastric emptying study.
In the meantime, you might try eating smaller, more frequent meals that are low in fiber and low in fat. A few cups of ginger or peppermint tea each day might be worth a shot. If it's really bugging you, ask your doc for a script for something like Reglan or Zofran for the times it's debilitating.
Good luck and let us know how you fare!