What is the cure for severe obsessive thoughts concerning ablution (Wudu') and prayer (Salat), to the extent of repeating Wudu' more than 5 times before each prayer, and repeating the final Tashahhud more than 10 times, and recording the prayer to ensure its validity, coupled with the fear that acts of worship will be invalidated due to not responding to these obsessive thoughts?

The treatment for obsessive thoughts is to turn away from them, pay no attention to them, completely ignore them, and strive against your own soul in doing so. Therefore, do not perform ablution more than once. Do not repeat ablution or prayer due to doubt. Do not judge your ablution to be invalidated or your prayer to be void except with absolute certainty that you could swear by. Do not repeat the recitation of verses or the tashahhud (definition). Do not record the prayer. And do not pay attention to the whispers of Satan regarding forgetting something or not pronouncing something correctly.