Is what I am suffering from—chest tightness and sadness, the regression of my discourse after it had progressed, and seeing dirty dreams daily—a satanic touch? And how can I be sure of that? And does heating water on which the Quran has been recited nullify the effect of the recitation?

What you have mentioned could be magic, and this can be confirmed by consulting trustworthy experts who treat with the Quran. The best ways to treat magic are for a person to treat themselves by relying on Allah, frequently performing prayers and supplications, and using lawful ruqyah. There is no religious impediment to heating water over which lawful ruqyah has been recited, and the blessing of the Quran remains whether the water is heated or not. The patience of a believer in affliction is rewarded and recompensed, for Allah tests those whom He loves, and the trial may be to elevate one's status with Allah.