lonely life

My lonely life have started again when my sister went back to Aberdeen today.
At first, I cried in depress.
Then, now I try no to be so sad.
But, every time when i see the things my sister gave me or helped me my heart felt pain.
I felt crying but I cant cry and my heart felt very very pain.
Why must I treated in this way.
Its very difficult for me for not remembering my sister.
Only she can make me happy, changed and cry.
I'm very depressed please help me.
I cant stand it anymore its very difficult.
Help!!!