There may be some light at the end of the tunnel. Ring up registrar and tell them you made a mistake. Tell them your credit card company advises you to charge back after hearing domain name. You should get credit. Good luck. IMO.
Disclaimer: Please keep in mind that this is a FREE appraisal. This is a guess at quick flip resale value not an unrealistic end-user price. Often times my appraisals are rushed, too low, or too high. Sometimes my advice is totally wrong and occasionally downright dumb. If the post stamp is after 5:00pm EST, the chances are even greater that inaccuracies will occur due to blood alcohol levels.