Called narcotic in! NOT ME!!!

Had an incident today that kinda has me freakin out! Need to vent.....A little HX....I have been clean for 5 years this fall. I went through my state's monitoring program and have completed all the requirements. I work for an acute dialysis program.
Now the scary thing...I get a call from a pharmacy asking why I called in a RX for Norco on a pt "x" under Dr. "Y". I have never heard of this pt. I do work closely with the doctor. However we 1. do not call rx's in in the acute setting and 2. I do not know his DEA number! The pharmacist had a caller ID from where the call came in and gave it to me. I, of course, called it and the voice message identified it as the same last name as pt "x", different first name.
Allot of things don't make sense....1) How did this person get my name: "Andy from Davita". 2) How did they know this doc's DEA number.
What bugs me most is I am finding myself defending myself even though I didn't do anything! I feel really weird now considering I diverted massive massive amounts of dilaudid from several hospitals in the state in the past! I immidietely called my boss and the doc. The doc did not recognize the pt, and we searched all of our chronic units and that name did not come up?????
Should I be worried, why do I feel weird? Any suggestions?
Thanks.