The first time I've put on a VR headset was for vestibular rehabilitation. They had different simulations to fight dizziness, although in the end my cause was different so it had little (positive) effects on me.

But it really opened me to the possibilities of the tech outside of gaming and consumer applications. It can probably have a massive impact in cognitive behavioral therapy or for training (I believe I spotted a few setups to train soldiers to use Javelins in Ukraine)