I tried marijuana one time and it has been over a week I have lost my sense of touch, taste, and smell.....Im scared this is permanent....do you know anything that could have caused this?

I'd say you're still recovering from the marijuana withdrawel. I remember what it was like after i quit and feeling like I would stay anxious for the rest of my days but I promise you it will go away..... The ant anxiety meds can prob give you anxiety attacks too. those sort of things are addcitive and throw that on top of the marijuana withdrawel and that's why you're feeling so anxious. not sure about zanax but i used to use valium when i first quit a lot of diff drugs and believe me it was hell but it did pass. Now no addiction is as bad for me. i get through it within a week or two ie:drinking. I'm on valium now for the first time in 6 yrs and i can't imagine it being hard to quit at all. I'm just using my second pack because i had other issues.
The future will be brighter for you my friend. trust me i have been there..

i.ve smoked weed for 6 years i,m stoned 24/7 and if you've been smoking 25 years your bodys way more used to it, a think your body just needs it if you stick to not smoking it might go away. i came of it for 2 days and couldnt handle it got realy badly anxious, i dont think its the pills.
good luck you actuly came of it:D

Since you have smoked for so long, your body is used to having thc in your system. While cannabis isnt known for causing withdraw symptoms, some heavy users do describe some withdraw as you have. It will go away and stay away form the xanax. ITs far far worse than cannabis and far more addicting