Each person is entitled to his or her own Earth experience and should be allowed to create the life they desire even if it means acquiring/suffering an illness or encountering a premature death. If someone has verbalized a request for you not to meddle in their affairs, you would be acting in integrity to avoid sending them healing energy. I know this is not the answer most empaths want to hear—you are very loving people who want to help others. However, our boundaries can be quite thin.
Make sure that your desire to share what you have received is not actually a personal need for your gift to be noticed or appreciated by the other person. Many religious people are afraid of intuitive spiritual gifts and their fear can cause them to miss the healing you could have offered if a different approach were used. So, the next time you get an intuitive hunch like this, you may want to keep it private and not mention it to the person it applies to. That way, you can inquire of that person's higher self (probably the one who sent you the message anyway) and send the healing vibes without usurping another person's free will.
PURCHASE paperback book, Whose Stuff Is This? Finding Freedom from the Thoughts, Feelings, and Energy of Those Around You at http://tinyurl.com/EmpathAmazon. The e-book version is now available for Kindle, iPhone, iPad, and other digital reading devices.