Answer
(Fatwa: 302/L)
Ma-sha-Allah, this is a blessed and auspicious dream. One who sees the Prophet (Sallallahu Alaihi Wasallah) in dream has been given glad tiding, as in a Hadith:
من رآني في المنام فسیراني في الیقظة (Whoever saw me in dream he will see me in a state of awakening.)
Mullah Ali Qari writes in Jamul Wasaail:
فیکون إشارة إلی بشارة الرائي لہ علیہ السلام بحصول موتہ علی الإسلام ووصولہ إلی روٴیتہ في دار المقام (جمع الوسائل: ۲/۶۰۹،آخر شمائل الترمذي) وفیہ أقوال أخر ومن شاء التفصیل فلیراجع إلیہ البتة
But, as far as the matter of blowing is concerned, it indicates that your are weak in internal actions (of Shariah), therefore he is strengthening it by blowing, as a sick man is blown upon for Shifa (recovery from illness). You are advised to abide by Sunnah in every action and recite Durood excessively. May Allah enable you to see such dreams time and again!
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband