Hi K.,
I am so sorry about your mother, and all that she (and you) went through before her passing.
I went through a similar thing (though it wasn't cancer, it was a very long period of incredible suffering) with my Mom 3 years ago, and some days I still feel the helplessness and loss as if it were just yesterday.
It does get easier to handle with time, though.
Of course you are thinking about death a lot, you seem to be surrounded by it. This is going to have an impact on you. That's totally understandable.
One key to not being obsessed by it is to be sure of what will happen to you at the point of death.
Do you have a saving knowledge of Jesus Christ ?
To have the assurance of eternal life is the best antidote I know for this. It leaves you with a wonderful peace in your mind and heart. To not have that assurance will leave a person feeling anxious and frightful, and understandably so. There is no peace without God.
God is perfect and holy, and nothing that is not perfect and holy can co-exist with Him. God couldn't stand that thought, because He created us for his companionship, and to be His children. He loves us so much that He can't stand the thought that even one of us should be separated from Him for ever, so He created a way "out" of our lost condition. That one way is Jesus, and to accept Him and His sacrifice for ourselves is completely free. There is nothing we can do to earn it, we simply say "Yes" to Him.
Just know that God loves you, and does not want for you to feel this way. He loves you so much that He allowed His only son to leave the glories of Heaven to come and live as a man on this earth so he could better understand our human condition, and so we could know that He understands what it is like to live as a human on this earth.
God then allowed His precious, perfect Son to take all of our sins upon Himself, and carry them to the cross where He was crucified, and 3 days later rose from the dead, so that we, by believing on Him and accepting Him as Lord of our lives can be saved from eternal separation from God (the correct definition of death) and can now live forever righteous and blameless in the presence of God.
Even as He hung on that cross, He already knew your name and mine. He could have gotten down from there and said "no", but he stayed and took it all. He did it in great love for US.
Now at the judgement day, when God looks at those of us who have said "Yes" to Jesus, He will not see our sins and faults, but instead will see only the righteousness of His Son, and will judge us blameless.
Paul (in the Bible) said that for those of us who are in Christ, that to be absent from the body is to be present with the Lord. In other words, the instant that last breath has beeen breathed out, we are immediately with God. No suffering, no darkness, just forever in the presence of perfect love.
For those of you who are offended by this message, it is easy to just disregard what you don't want to read. So there is no need for nasty letters. Simply disregard this. You have a delete button, and you are just as capable of deciding for yourself what is good for you as the rest of us are, none of us are blind sheep here.
I am simply offering the truth as I know it to be, and offering a lifeline of salvation, eternal life, and perfect peace of mind.
You are free to choose it or not, just as I am free to choose your way or not.
I hope you will choose to consider it though, as it has been written in love .... the same love that sent a beloved Son to die and rise again for you, too.
Merry Christmas to all.