I'll state right now, that I don't believe that any mediums or spiritualists are anything more than charlatans, but that's not really the point I want to make.
People seek comfort through various means after a loved one dies, and that's entirely understandable because it's a terribly traumatic experience to go through. I wouldn't wish to rubbish anyone's beliefs at that kind of time in their lives, but would always advise caution. There are a lot or people in the world who will use people at a vulnerable time to to gain money for their own purses. I think that there are plenty of 'mediums' out there who will pocket your cash whilst coming across very caring, and helping you very little. Rather than talking to them, would it be more advisable to speak with friends, family or a professional councillor to help you deal with your feelings of grief and loss?