Pain killers = ? sharing the gospel, witnessing Helping others to be free of the pain of bad emotions, bad thoughts and past mistakes by introducing them to Jesus Christ.
Nursing mother = mother = symbolizes the Holy Spirit. Perhaps the Holy Spirit coming into the life of a new convert. Nursing them with teaching and leading etc.
Perhaps the Lord is showing me that I may be instrumental in leading someone to the Lord, perhaps in the near future. Help introduce them to how they can relieve their spiritual pain. The dream indicates that there most likely have already been other converts in the past. Which there has been