MSH466,
When we get older and have physical problems things get really confusing as you pointed out. But if you just give up all of your problems to God everything will work out OK. God's all we ever had and all we need. It states in the Bible to "take no thought for the morrow because the evil is sufficient unto the day thereof." (I quoted that from memory, so it may not be totally correctly quoted.) So, just put everything in God's hands. He has a plan for you and it's a good one.
I wish you the best.
PML