This is hard to say... This drug works on serotonin receptors in the brain. Serotonin is involved in pain perception, and drugs to increase serotonin like Cymbalta and amitriptyline work in an opposite way. But I haven't seen it listed on any PN drug lists as causitive. I don't think many people use it that often either which would take much longer to get the post marketing reports.

Why not switch to ginger extract for the nausea? Taken with a glass of water (to reduce reflux), it is very effective for nausea.
I use it myself since I have a congenital condition of twisted GI tract which sometimes causes nausea for me. I get mine at Puritan's pride...it is very inexpensive. Just don't lie down right after taking it, as it burns if you burp it up.