I am very sorry about your loss. Unfortunately I can not understand completely but I do know what it is like to lose the one who understand and loves you the most. In this case it was my best friend and when she decided to run away from home the pain for me was almost too much. I don't really believe that I may never see her again and even though I am sure she is not dead I can only imagine the pain i would feel if she was.
A loving god would not want us to feel this way and He did not design us to just live a little then die. In Romans 5:12 it says, "That is why, just as through one man sin entered into the world and death through sin, and thus death spread to all men because they had all sinned—." So we know that we were not made to die but from Adam we have all sinned and that proves that death is unatrual and that is why we suffer so. But we are given a hope in Romans 5:17 and 19 " For if by the trespass of the one [man] death ruled as king through that one, much more will those who receive the abundance of the undeserved kindness and of the free gift of righteousness rule as kings in life through the one [person], Jesus Christ." "For just as through the disobedience of the one man many were constituted sinners, likewise also through the obedience of the one [person] many will be constituted righteous." If persons are constituted righteous then we will no longer sin and consequently no longer die.
In Acts 24:15 it says "and I have hope toward God, which hope these [men] themselves also entertain, that there is going to be a resurrection of both the righteous and the unrighteous." So you will have the hope of seeing your mother again and all others whom you may have lost in death even if you happen to die before this promise of God is fulfilled.