That nausea can come with the pain meds. If what the doctor has given you to counteract it isn't working, do give him a call. Same with pain relief. You should not be at a high level of pain during the day or night.
Please tell me exactly what your schedule is for taking your pain meds....name of the drug, strength, dosage prescribed, when you take it and how many pills you take with each dose. Maybe with this information I can see something that might help you. It is so very important to keep your pain properly managed!