Worrying about my dogs future passing.

Hey guys. This is a bit silly, but I find myself worrying about my dog.

Shes 11, and shes my first pet of the 4 legged variety. Shes my rock, I've had her since she was 12 weeks old and throughout my hardest times.

She doesn't play anymore, not even tug of war when I try play with her, or fetch. She has cataracts already. She sleeps all day. She just wants to be with me all the time, napping. Which is fine by me, I'm disabled so I spend alot of time in bed now.

I know I only have a few years left with her and its hard to imagine my life without her. Shes been my constant companion for years. We have always shared each others presence.

I'm just worried on the day she passes, I'm going to break down and she will be scared because she sees me crying. I don't want her passing to be anything but peaceful. I want her to not notice that I'm sad, but I don't think thats possible for me.

Can I get some advice on what I can do to ensure when she goes, if its within my control, that she goes without distress?