The Dr. and drug test

I am 30 and have 2 sons and 2 step daughters. I have been with my husband 6 yrs off and on. I have been to prison in 06 and NEVER plan to visit again. I am in rehab and AA. Most recently I failed a drug test for benzo's. I have not takin anything and have found out that I am still untrusted. I have searched high and low to see what could have caused me to test positive for that, but so far no luck. I have been sober almost a year and am not willing to give that up. I just feel like all this hard work was for what to still be mistrusted and looked at like a lie?? I don't know I know I have done wrongs in my life and I have done good to. When does it stop all the bumps and hills in the road? I am getting tired of provening myself time and time again and not gaining any trust with my Dr. It really hurts to have her look you in the face and say "you know when an addicts liying?" " there lips are moving" that cut me like a knife. So tomorrow I am going to drive almost 2 hours to start with a new Dr. that I hope will learn to trust me and respect me too. I feel bad leaving my Dr. but I feel that she doesn't trust me anymore then the day I met her and that makes me not trust her. She to is in recovery and I would think the last to judge and cast a stone. I know she deals with all type of **** from patients, but this far into my recovery I would think we'd be somewhat past this. I have always been open and honest withher from day one and she has not been with me. Just shows you can't really ever know someone.I really resent that I have to start over with a new Dr. and go through all this at this stage, but I have grown she hasn't and I am not going to confess something I DID NOT DO TO PLEASE HER OR ANYONE.