my pdoc told me that zoloft is anti-worry, have you talked with him about trying other meds?
half an xanax isnt that much med if you have severe anxiety (atleast its not very much for me)

you would want to a professional so they can diagnose and treat you

i was very bad before i started medication, i can say the meds take the edge off... you just have to keep trying different meds till you hit the right ones