Saw MSN in dream at time I read In Pursuit of Angelic Power and Awrad for 1 day. He came to my house & was eating & looked at me but I felt he was angry & then I woke up but I woke up happy that I saw him.
wa alaykum salam,
As you said, what greater happiness than to see your Shaykh in the dream, and even better in the Hereafter.
As for seeing him angry, look inside yourself, with Mawlana as the mirror to find the cause of his anger. Allah knows best.