Dr. Marvel and the Center for Pelvic Pain at Annapolis now offering sedation gynecologic procedures using the Nitronox™ analgesia system as a way to effectively manage pain and relieve any anxiety you may feel before and during gynecologic exams and procedures. ... Patient Portal. Access your personal health information and test results ...About Us‧Meet Dr. Marvel‧Services‧Contact Us‧Virtual Visit‧Immediate Care.