I'm going to make a run down on how I feel is the best way to take on this
1. We all, maybe some not as frequent as others, have premOnitions and/or future seeing dreams. Not being able to control them is sometimes part of the whole package. You can however help Induce these dreams or premonitions with some simple meditation and herbal incenses and teas, pm for more info on that.
2. Despite contrary belief that society says about not being allowed to tell the person the prem/dream is about, you can infact, and should if necessary. If you want to have a more discreet approach to things, say the person will be attacked by a thug, say that crime or whatnot is on the rise lately and he/she should invest in self defense.
3. Being empathic about other's feelings before they receive it themselves can be good, and can be annoying at times. Meditation, prayer, and a firm will surpress this ability.
I hope this helps. Pm for more information, I will help to the best I can.