It’s funny that you asked your question now. See R’ Yitzchak Zilberstein on this weeks Parasha: someone had a dream Rosh Hashanah night where his recently deceased father appeared to him, and told him that before he had died he had a sum of money that belonged to someone and he had not paid it back. He told his son where it was located in the house, and who he should return it to. The son checked the place where the father said, and lo and behold it was there.
Still R’ Yitzchak ruled that he didn’t need to give it back as the Gemara says that ‘divrei chalomos ainan malim oi moridin’ (see Sanhedrin 30a, amongst other places), in other words a dream cannot engender a halachic consequence.
Based on this gemara the Shulchan Aruch in Y.D. 255,9 rules that one does not have to comply with things heard in a dream, however convincing they may be.
Listen to your rabbi, but R’ Yaakov Hillel shilta told me that today it is very very difficult to take into account what we see in dreams.
Hatzlocho