Dear Hope,
God assigns when a person is going to die. Only he knows when that will happen.
I don't know if you are a believer in Jesus Christ or not, but if you are, I can tell you this. If you read the scriptures, you can see where God revealed to some if not all of the apostles that they would die for the faith. I believe he did so not to discourage them, but to help them get their affairs in order. And also to prepare them for what was in their future so they would not be caught off guard. God will not put things on us that we cannot handle. That is not his way. He will pave the road to glory.
So if you are a believer, you must determine if these feelings are spiritual in nature of physical in nature. For the enemy of God is seeking to take your life at all times.
We are protected, our lives our sustained by God from the devil.
So if your feelings are physical, then it is the enemy of God working through your flesh to make you believe his lies. Do not believe his lies. He wants to destroy you. And if you are not a believer, chances are the feelings are indeed not from God, but the enemy of God. So don't give into to them.
Yet, if you are a believer, I suggest to you that you don't ponder on things that you cannot change, and if it is the will of God to take you home, rejoice. Yet, until that time happens, continue to walk the walk of faith.
Yet understand that to die as a believer is death only in the flesh, for your soul goes to be with Jesus in paradise.
If you are not a believer, then maybe it is time you turn to he who breathed into you that breathe of life you fear losing.