السلام عليكم ورحمة الله وبركاته
Looking for treatment for OCD does not affect your Imaan whatsoever. If you would like to do that, then it is up to you.
From an Islaamic perspective, you should do the following:
1) Recite Ta`awwudh (
A`oodhu Billaahi Minash Shaytaanir Rajeem) ten times every morning and every evening.
2) Try to always be in a state of Wudhoo (this can take some getting used to. It may be difficult at first, but it gets easier and easier, until it reaches a point where you will feel uncomfortable if you don't have Wudhoo). OCD - Wasaawis is caused by Shaytaan, and Wudhoo is a Muslim's protection against Shaytaan.
3) Recite Aayatul Kursi and the three Quls (Soorah al-Ikhlaas, Soorah al-Falaq and Soorah an-Naas) before sleeping.
4) Recite the last Rukoo` of Soorah al-Baqarah every night.
5) Increase your recitation of the Qur'aan, as well as Adhkaar. When a person's heart is engaged in the Dhikr of Allaah Ta`aalaa, Shaytaan cannot affect him. Think of the Dhikr of Allaah Ta`aalaa as an impenetrable fortress: the moment you enter it, none of your enemies can reach you.
6) Make Du`aa after every Salaah and after Tahajjud that Allaah Ta`aalaa grants you complete Shifaa (cure) from it. This is extremely important to do. Du`aa is the weapon of a Mu'min.
7) Ignore any Wasaawis and doubts with regards to Tahaarah, Wudhoo, Ghusl, etc.
8) Recite the following Du`aas three times every morning and evening: "
A`oodhu bi-Kalimaatillaahit Taammati min Sharri maa Khalaq." And this one:
"A`oodhu bi-`Izzatillaahi wa Qudratihee min Sharri maa Ajidu wa Uhaazhiru". And this one: "
A`oodhu Billaahis Samee`il `Aleem minash Shaytaanir Rajeem, min Hamzihee wa Nafkhihee wa Nafthih."
9) Recite the following Du`aa three times every morning and evening: "
Bismillaahil-ladhee laa Yadhurru Ma`as mihee Shay'un fil Ardhi wa laa fis-Samaa', wa Huwas Samee`ul `Aleem." (This Du`aa will also protect you - by the Permission of Allaah Ta`aalaa - from any calamities afflicting you.)
10) Toilets are places of Najaasah and are inhabited by Shayaateen, so people should keep their time there to a minimum. Meaning, don't adopt the habit of reading newspapers, books, your phone, etc. whilst in the toilet.
May Allaah Ta`aalaa grant you complete Shifaa, protect you from the Shayaateen and their Wasaawis, and grant you peace of mind, tranquility and contentment.
آمين يا رب العالمين