Sharing Our Innermost Thoughts

Obsessive Compulsive Disorder.
Male, 24
What should I do if in my mind, all the time, the thoughts of feces used to come? These thoughts used to come while having food. How should I deal with it effectively?
Bad thoughts of feces comes in my mind while having food. How should I overcome it?
Yes, I had a similar experience before but I used to deal with them through Meditation.
I am dependent on Meditation.
These thoughts used to come in weekends every 1 hour.
After every 1 hour it gets repeated.
The nature of these thoughts are human feces.
These are images.
In my childhood in grade 1, my classmate used to carry me and was trying to throw me in someone’s human feces which was spreaded around the school’s washroom. So, I think because of this incident, I am facing the trouble thoughts. nowadays.
That guy used to remove my clothes inside the church and he actually removed my pant in the school classroom in front of girls during childhood.
I don’t know whether he is alive or not. His name “Chris Aaron D’souza” I still remember.