Extreme Bad thoughts about prophet muhammad saw

Asalamualikum I always suffer from extreme bad thoughts particularly about prophet muhammad pbuh and i have read a lot of online data and watched videos of scholars that it is the waswas of shaytaan but i am not able to stop myself from paying attention to these thoughts.i also tend to feel sometime that these are my own thoughts.i am not able to ignore these thoughts.and at height seldom i tend to repeat these thoughts in my mind and head and often feel an extreme tempation to say these in my heart.kindly help and pray for me