He'll likely want some medical history. Docs don't like patients who appear to be shopping for meds.

"Doctor, Since my concussion, I have times where my anxiety gets really bad and I get a headache. My blood pressure spikes (If this is the case). Could I use a blood pressure med like propranolol or atenolol to help with these when they happen ? I know people in similar situations who have had success with BP meds for this"

Explain the frequency. That you want to try half of a usual dose first. Explain that you are concerned a benzo will make you drowsy and is addictive.

Tell him about your triggers, too much stimulation, noise, effort, emotional strain, etc.

btw, Xanax, Ativan, clonazepam, Valium are all benzos (benzodiazepines)

Have you tried your BP kit yet ?