Oh Karen~~ I read your post w/a huge lump in my throat. Your love for your parents is something I can relate to. We had lost my Father 3 1/2 yrs B4 my dear Mother passed. She missed my Dad every day. In fact, she really never did get over her loss.
Try to keep your Dad occupied and busy. That's what we did w/our Mom until she got sick. I want you to know how sorry I am for your loss, and how inspiring it was to read your post. Your Mother passed into the Lord's loving hands knowing how much she was loved by her family. That is such a gift.
Take care of yourself Karen. I will keep you all in my prayers. You are a wonderful daughter...