Seeking a Surah for intense OCD struggles

Assalamu alaikum everyone. I'm going through a really tough time with severe OCD, and my thoughts are starting to blend into reality. I still have some awareness, but it's super hard to handle. My therapist had to cancel our appointment, and now I can't see her for a whole month. I know turning to the Quran is powerful, so I'm wondering if any of you could recommend a specific surah or dua that might bring some relief in these moments. JazakAllah khair.