Ok, I would definitely say the benzo based anti-depressants are the culprit of this.
Look into detoxing benzos. You may be shocked, they are said to be the hardest drug to endure the detox of.
About the deficiencies. I don't think that is what is causing your symptoms, BUT with detoxification of this magnitude, you are going to need some supplement help.
I know the Natural Hygiene frowns on supps, but I had to give in and take them and they help a lot when you find the right ones for you, which takes some trial and error.
Since you have no known mercury, I think chlorella would be the place to start. It's a whole food, and has tons of chlorophyl which is great as a detox aid.
B complex is a must, get one without synthetic folic acid like Nature's Made B Complex.
Vitamin C, selenium, zinc and possibly introduce kelp at some point. Trace minerals are really helpful too when detoxing like this
Epsom Salt baths daily will help tremendously in aiding the detox, but you will have to start slowly and see how you react.
I think once you research the benzo drugs, you will understand your situation better and can then find the right path for you. It may or may not include Liver Flushing right away. You might have to build up your mineral reserve first.
It's all about the liver for you at this point and getting it to release the drugs without it feeling like it's killing you in the process.