I would say that the type of prayer we use in asking for help for ourselves is the key to whether it is answered or not. A prayer that asks for more wisdom and knowledge and understanding of self or others usually provides us with the type of answer or help we might be in need of.
In helping others silence is good, but if that person still has unmet needs it is ok to tell of what you have done in a non-bragging way to someone else who may be able to fill the rest of that need. It is kind of like that movie that talked about paying it forward. That is a favor done for you translates into you doing favors for others. I believe there is a great blessing in just the good feeling one gets from helping others and seeing that look of thankfulness in their eyes.