Mark, you and your family are in Kathy & my thoughts and prayers. I lost my Mom in March of 1983 - she was sick a long time, and we knew it was coming. It wasn't any easier to deal with, though. I think of her a lot recently, seeing it's coming up on 30 years since she passed. I can tell you this.... You're going to have more bad days than good ones for a while, but slowly this will get better. A day WILL come when you can think of her and smile. And then, maybe years down the road, a day will come when life gets busy - and you DON'T think of her... (Not to sound insensitive to your grief, God knows I wish she could have lived for many more years. ) At that point, you're at peace with what happened. You can bet that's what she wanted. My Dad died 22 years ago - suddenly - of a heart attack. I found him at his house, in his bed, after he died. It was the same process. It took a long time, just as it did with my Mom.
Just remember - life does go on, she wouldn't want you to spend the rest of your life mourning - and you'll most definitely see her again!
Hang in there, friend. You've got a great group of people here, any one of us are here to talk, or Skype, or EMail to.
Bill