What is an advice and dua and cure for a person who is truly religious, strives to improve but in reality suddenly gets a spiritual breakdown which is really bad, gets bad thoughts, cannot control feelings, struggles with wudhoo and even namaaz

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I recommend the following:

One: increase your knowledge in Islamic Law and Islamic Beliefs. Taking online seminary courses is highly recommended.

Two: say La ilaha illallah 100 times a day

Three: Read this Dua daily:

بِسْمِ اللَّهِ وَ بِاللَّهِ ، تَوَكَّلْتُ عَلَى اللَّهِ ، أَعُوذُ بِاللَّهِ السَّمِيعِ الْعَلِيمِ مِنَ الشَّيْطَانِ الرَّجِيمِ

Four: Wipe your hand on your chest and say three times:

بسم الله و بالله محمد رسول الله ، و لا حول و لا قوة إلا بالله العلي العظيم ، اللهم امسح عني ما أحذر