Ok mam I can understand your issue .. basically you are suffering from repeated thoughts image disturb you and you feel stress because of it so  it's OCD obsessive compulsive disorder. it can be treated by medication also  therapy like cognitive behaviour therapy  exposure and response prevention also called ERP. Mam it can treat by proper medications no need to worry I know because of repeated to thoughts you are not able to doing your proper work and also it disturbs your concentration and  attention but mark my word it's it's treatable just you need to consult psychiatrist so we will see we will start medication