Testosterone, HGH, other supplements are hardly going to fix your condition like exercise will.
Anxiety is such a broad condition that I can't even go into detail about it. There are different causes and there is a difference between anxiety developed and genetic "legitimate" anxiety. Much anxiety is developed from alcohol and drug abuse.
Your Benzodiazepine can cause anxiety during withdrawals and this can happen as you develop tolerance to it.
You need to do a lot more research and figure out why you have anxiety. Perhaps see a psychologist. Self administration of drugs will not work until you or a doctor neurologically know the cause of your problem.
This is not so much an SD dicsussion. That is all.