Thank you for sharing your experience with us. Please take everything that I share to the Holy Spirit as He Alone gives the accurate interpretation.
It might be best to share your experience with the same pastor that prayed over you and gave you the word of knowledge if you believe that he is a true man of God.
What came to mind was that you have been anointed with a prophetic/healing/revelatory gift for a responsibility that has been/or will be bestowed upon you. Shoulders in the context of what you described represents authority or government(rule/leadership). I think of Isaiah 9:6.