As long as you are using it legally (and aren't taking it so that you're impaired at school or work), there's no reason to report it to anyone. Your health information is private, just like anyone else's.
People take benzos for flight anxiety and to help get through dental treatments. People take Vicodin after surgeries. These are all legit reasons for taking controlled substances, and I'm sure many of your classmates and fellow pharmacists have done these.
Perhaps you feel differently because of the stigma of having a mental health issue? You'd probably be surprised how many of your classmates and fellow pharmacy students battle anxiety, depression, etc. School's stressful, and pharmacists can have demanding jobs, too. It's better that you're doing something about it and getting treated.
By the way, for anxiety, are you taking anything else besides a benzodiazepene? Are you going through counseling to help with the anxiety? You're a third-year, so you probably know that benzos are usually short-term, but an anti-anxiety med and counseling are better for long-term treatment. Still, even with another med and counseling, there's no reason to feel bad for using an occasional benzo to help with an anxiety attack.
