I thought how terrrible it would be to miss out on meeting my son. Even more terrible would be for him to grow up without a father. So even though I often think G-d answers the opposite of whatever I pray for, I asked him they wouldn't find any evidence of a heart attack and that I would get to live to be able to raise my son. The doctors were unable to find anything that indicated a heart attack, although they shot my artery full of nitroglycerine. It seems G-d has answered my prayers.
All this time, I thought G-d didn't care about me and didn't have a purpose for me. I begged him for death several hundred times in the past few years because my life seemed so meaningless. But now I have a son. It could be that my only purpose is to raise my son.
We often ask G-d to give us some direction and tell us our purpose in life. This is mostly so we can the most out of life and don't think of how G-d wants to use us to affect the lives of others. Jesus' purpose was to deliver us from sin. Paul was a tentmaker, but his purpose was to preach the Gospel of Jesus and lead by example. I look at people who seem to have a great purpose. They often are the people who benefit the least from the purpose G-d has placed on them. When G-d calls you to a purpose, he will send you to a person or group of people. Most people believe their purpose is tied to their occupation. Paul never benefited from his purpose which is why he used manual labor to support himself.
In the Book of Proverbs, children are mentioned as being a heritage from the Lord. Those with sons are considered especially blessed. I believe that a childless man has the potential to win thousands to Christ. But I also believe there is no higher purpose than to be given the opportunity to raise a godly son, even though I may never personally benefit or enjoy the fruits of my labor. In the same way, your own purpose was designed with someone else in G-d's mind.