I would to ask recently I have developed this thoughts where it is very negative and constant swearing bad words in my head.i am not sure what’s going on.i had scan done and everything is fine and all the test they did is all good.I am very worried about is.
Such thoughts could be a result of your environment or even watching foul language on tv. You have to ignore these thoughts as they are waswas from the shaytaan! Recite your daily adhkar and keep yourself busy with the remembrance of Allah. Also perform ruqyah on water and drink lots from it every day.