My pain Dr. Switched me from Butrans patch to fentanyl. From the first week with this patch (can't take pain meds orally ) I started having serious side effects. Dizzy,disoriented, sweaty, hard to breathe, shaking, muscle twitching ,horrible waves of , nausea and heart racing ,extreme full blown panic attacks I felt like I was going to die. Took patch off rushed to ER and they could find nothing wrong. I was only on this patch 25 mcg per hour, for just under 3 weeks. Still don't feel right.