Registered Nurse

Please help! Need advice on medication error. I am a new grad, just 7 months as a nurse. Yesterday I made my first medication error by giving my patient lasix instead of solumedrol. The premix medication that came from the pharmacy had the correct pt's name, drug and dosage but the attached vial which I did not double check was furosemide 40 mg. To make the story short, I immediately reported my mistake to the MD, pharmacy and the weekend supervisor. Made my incident report, monitored my pt. No allergic or any adverse reaction was noted and Pt's vital signs remained stable until my shift ended. I could not sleep and I still have a terrible headache. I feel very stupid and so guilty for my carelessness! To add to my worries, my charge nurse just called me and told me that I might lose some points on my lisence for this very big mistake that I made. I am terrified and very scared right now. Please reply anyone!