I have fibromyalgia and have been on fentanyl patch, 75 mcg/72 hours for 2-3 weeks. I suffer from nausea within 18-24 hours after placing the new patch. The pain relief is phenomenal, but the nausea, sweating side effects are bad! Is this something that will subside as time goes on? Does my body just need to adjust? If so, how long? I also have insomnia the first night of wearing the new patch then severe drowsiness for the remainder.. Can doze off way too easily! Sounds weird to me. I am in love with the fact that my pain is so much better. Has anyone else had these side effect symptoms? And if so, does it get better or do I just need to learn to get used to it?? Any help, suggestions, feedback will be greatly appreciated!!