My doctor prescribed Domperidone taken half an hour before Levadopa and it stopped the nausea.

The doctor at the ER gave me some nausea meds to take with the meds for PD. I am losing weight and having trouble finishing my meals.

try a Probiotic also to help and take your meds with a shake like Ensure or Slimfast you get the idea; also there are anti nausea meds that help.

I've been on Carbidopa for 5 months. It still makes me tired and sick, but PD Symptoms have Much Improved! Taking pills with some food sometimes helps. (My latest doctor said it's okay). Lastly, swallowing with flavored Seltzer-Water also soothes my stomach!!