Does uttering Satanic whispers concerning the essence of God and the reality of the universe, with the aim of finding relief from intense overthinking, constitute associating partners with God (shirk)?

The ruling on obsessions that afflict a person without settling in the heart has been previously explained. A Muslim does not exit Islam except by performing actions that contradict it. What occurred with the questioner, we do not believe it to be among the nullifiers of Islam, because obsession attacks without a person's choice. However, it must be repelled, and one should not succumb to it.