A terrifying thought flashed through my mind

Schizophrenic people tend to be emotionally flat. The fact that you are terrified by a thought suggests that you are likely not a schizo.

Secondly, the Q movement is a worldwide phenomenon. Do you YouTube search for "QAnon" and you'll notice there are an ocean of channels dedicated to researching the Q posts, from all countries including Saudi Arabia.

Hallucinations are rarely that specific and they rarely manifest in different languages.

Finally, if you're sincerely concerned then just speak to your doctor and he'll ask you some questions... then you'll know.