I havent fully recovered from my pcs and its been going on for the past 6 years, as well as on and off before then. I havent been able to tolerate head shaking/bumps much since then.

Anways, I went on vacation for a week. The flight there was ok. The landing was relatively soft, and I stood up so that my knees could absorb some of the impact.

On the way back, the landing was very hard, causing some passengers to go "ooh" when we landed because of the bump. I was again standing up to soften the blow, but as soon as we landed, the impact immediately forced me into my chair. At the time, i didnt feel any immediate symptoms. However, since then (this all happened yesterday) Ive had a feeling as though im still moving (not dizziness) and I had a very restless sleep, which normally happens to me after some sort of head trauma. Also, ive felt slower (processing speed) since then.

Fwiw, no one else on the flight was hurt, and no mention of it afterwards by any passengers (other than me).

Could this force have caused a concussion/damage? Thanks