I know everyone out there is a bit frustrated with the whole Herpes scene because there are so many presentations - from typical recurrences with the standard rash/pain to the whole other side of the spectrum - symptome free for years.  Based on what you describe I can tell you that when someone has herpes they can still get false negative or if they don't have it they can still get false positive.  Find out which specific test your doctor did both times; find out if in both cases they ran a "control test" along with it - which helps to confirm the accuracy fo the actual herpes test findings.  I also wouldn't hesitate to get a second opinion.  Finally I'd be sure to either wait till you have that second opinion before gettin intimate with anyone - or err on the side of caution and even if your partner uses a condom routinely - at minimum tell them before hand that you may indeed have herpes.