Medication error question

hello all, question i have is. i'm in the military and occasionally work for a temp agency; well i have been working at one hospital for almost a yr. i've never had a problem until this. i was working night shift and it was very busy. one of the other nurses was busy when her patient called and asked for pain med's. i asked the nurse if she would like me to administer the pt the prn med. she said sure. well we have a med dispense machine so i logged in and withdrew the correct med and gave it to the patient and asked her to chart it in the mar. well 2 wks passed and i was a day away from deploying back to iraq and i got a call from the hospital. they asked me why i gave the med to a patient who was not yours and why it wasent it documented. i told them what had happened and they told me this doesn't look good. i told them that's what happened. well im deployed to iraq right now and my wife told me that i received a letter in the mail stating to keep short that my story didn't match up with the other nurses and i needed to write a statement to the board of nursing and i was no longer allowed to work at that hospital. seeing i don't have the letter here, im going to write the same story i just told you. i'm concerned what will happen to my license. can anyone please let me know what will take place after all this is settled??? thank you all so much.