There are others on this forum who have had success treating dizziness/vertigo. Using drugs to treat the symptom is only a short term solution. Since PCS is an injury, working on healing the underlying injury causing the specific symptom is best.

Hopefully, someone with success with dizziness/vertigo will read this and post their experience. If I remember, they may have worked with specialist ENT's to repair inner ear injuries that are common to PCS.

Not every symptom has an injury that can be healed specifically. The diffuse axonal injury is a difficult injury. The focal injuries may have serious symptoms that require therapy to help the brain rewire around the injury, if that is possible.

Many of us have learned work-arounds and accommodations so that we can return to a high function despite the unhealed injury. We have disciplines that allow us to live higher functioning lives.

The drugs many of us take are usually focused with enabling us to get better sleep, avoid intense depression or anxiety symptoms, control seizures, lessen headaches, etc.

I have propanolol in the cabinet for the rare instance of high blood pressure associated with a panic attack. I have not needed it in years due to my ability to prevent/avoid such events.

Do you monitor your own blood pressure with an 'at home' blood pressure kit?

Is there any evidence that your high blood pressure is related to your concussion?

What steps are you taking to lower anxiety levels?

Propanolol does not reduce anxiety. It just works to lower blood pressure and reduce the headaches that are caused by high blood pressure.

One of the side effects of butalbital, a component of Fiorinol, is dizziness. The caffeine in it is contraindicated for PCS.

Sounds like your doctors have been trying the "try this and see if it helps" method of health care. This is not uncommon for PCS.