Suggest Treatment For Stress When On Zoloft

I have been taking 200mg. of zoloft prescribed by my doctor for some time now and I started at 50mg., then 100mg. and I was under tremendous stress the dose was went 100mg. twice a day. I recently started a new job and was sent to a facility for urine test. They said test came back with benzo so they they let me go. I have done a lot of research and found others that had the same problem ( a false positive reading ). The Federal and drug Administration and other websites with others who take zoloft and came back positive. I printed the page on the FDA and it is confirmed they have heard people getting false positive readings and were fired. It is not fair to fire people and take the test and besides it was prescribed by your own doctor. I have to go to the medical center and get another test. What if it shows for benzos? I am on 200mg. of zoloft every day and that is the highest dose a person can take. Please at least give me your advice. Thank you.