I would follow your docs advice. If you told him/her your past and were honest, then why would you not follow her advice? Why even go see the DR. I understand where people are coming from being leery of taking addictive meds but lets remember... you came here to fight a drinking problem, not Ambien. The goal here is to get you into recovery. It might be hard to do that with several sleepless nights in a row. My advice is to follow your doctor's advice and continue being honest with him / her. If you find that you are abusing it (and we all know the difference if we're honest) then it should serve as a warning sign that you should not take it.
Just my two cents...
Best of luck and congrats on the 10 days!!!