I was already taking maximum dosages of all med useful for PCS before the concussion except for zanaflex, a muscle relaxant, which relieved greatly the pounding headache I was having almost constantly.
I did find a homeopathic remedy to be helpful. Vertifree, affordable, available online, eases the dizziness and nausea.
Also, I suspect that when I struck my head I displaced some of the canaliths in the inner, tiny crystals that play a part in balance. I tried a treatment for this called The Epley Maneuver, very simple, and found it helpful. You can find it on YouTube. Doctors and Physical Therapist may do this but you can perform it yourself. In any case, it harmless.