Suggest Medication To Control Stress

I am an A type person, and have taken on a much higher of stress that will last for years. I had been on lorazipam for two years and it kept me stable. My new Dr. started me on Sertraline. It is not working very well. I have recently read that sertraline is the generic of Zoloft which I took several years ago. It didn't work then either. Should I go back to lorazipam or can you suggest something else?