Momo reverse sneezes all the time. He'll recover on his own, but if it last long, I cover his nose & it'll stop. It makes him swallow & the spasm in his throat will stop. If he does it often, I will check inside his mouth & sometimes my long hair will be stuck in there & I have to pull it out.
He loves playing w/his ball & sometimes my hair will get stuck on it...I'm always cleaning my floor!
It also helps if you could get it on video & show your vet. Hope it's nothing serious.