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I'm here copying the same words which I wrote in the last thread.
I had this same problem and that includes ALLAH ( means who is the creator of Allah(s.w.t)) Sister you should say to yourself in boldness that YES I DO BELIEVE BLINDLY NEVER MATTER WHETHER IT EXIST OR NOT!
Try overlooking, if its come again and again and be busy in your life. Try spend your time with family and friends.
www.shariahboard.net is not working properly otherwise I would have shown you my questions (as same as yours) and how mufti sahab replied it.

Me too have this same problem, but alhumdulillah its gone now. Waswasah used to come in all worships including wuzu,ghusl,Paki/Napaki etc.
I wrote my situation to Hazrath Mufti Nawal-ur-rahmaan Sahab, he said me just do everything once (wuzu, ghusl, namaz) and don't care to it plus also apply oil to head in night. I just acted upon Mufti sahab's mashwara like avoiding the doubts. I used to do Sajda suhu daily in almost every salah, but when I acted upon mufti sahab's maswara. Its fine alhumdulillah. Slowly slowly everything vanished. It is your Imaan/fikr which is making you think its not valid its not valid on the other hand Shaytaan is giving you smooth dose of this Imaan. SO be bold.

After every salah read Last two surahs of Quran (1-3 times).
Sister, if possible consult psychologist and take medicines