I had one friend drink a beer to help when she was engorged and needed to relax and help her letdown. Said her doctor told her to. She said she never knew if it helped the milk issue, but she felt more relaxed.
So you can try drinking a beer if you aren't opposed to drinking beer as a rule. If it works, then it works. If it doesn't, you can tell them you tried it and it didn't work for you.