Best Is Surah Mulk as it gives one protection from the punishment of the grave.
One of the companions of the Holy Prophet Hazrat Muhammad (PBUH) has already repaired his tent on a tomb without knowing it. When he came to know the tomb, he recited this Surat al-Mulk. Then he went to the Holy Prophet Hazrat Muhammad (P.B.U.H) and related the incident and his ...
Assalam o Alikum
It is my believe that as long as one, in their heart realizes that what they have done or what they have wished for, is not in accordance with the teachings of the Prophet (PBUH) and Quran and hence wrongful, they are on the right path. Allah (swt) is Rehman and Rahim and will forgive the one who repents with true heart.
Refering to your question: Can the grave of the Prophet ever be worshipped?
No. Because that will just be shirk. Allah swt said, worship Allah alone. As muslims and believers, we must respect and love the Prophet of Allah (Salallahu alayhi wasalam) and thats important.
But when it comes to ibadat, that will be wrong because he is not god, ...
I also have this problem, and i think slow speed can overcome stammering and along with that reading Dua which is "رَبِّ اشْرَحْ لِي صَدْرِي وَيَسِّرْ لِي أَمْرِي وَاحْلُلْ عُقْدَةً مِنْ لِسَانِي يَفْقَهُوا قَوْلِي" this will help you reduce your stammering.