My condolences Gary.
I can also sort of say that I know how it feels.
My mother fell and broke her hip last November at age 89. She just didn't have the strengh to heal, and after surgery and then rallying a couple of times, she weakened and died a month or so later. My dad, her husband of 60 or so years couldn't handle the loss and died just eight days later. He literally couldn't live without her.
Somehow when I look back I don't believe I had the strength to get through it all, and handle the loss of both of them, handle their estate, and keep going. But I did.
There seemed to be a strength or power beyond me, that kept me on track through funeral arrangements and legal matters. Looking back I don't know how I kept going, but I did.
People say they had a good and long life, but it doesn't lessen the loss. You still end up feeling like an orphan.
I know I'll miss my mom and dad, and have them in my mind and thoughts every day for the rest of my life. That gives me some solace. They're certainly still with us in that sense.
I miss the phone calls too, but I'm sure your Mom would want you to keep going and stay as strong as you can. It's part of life, and we'll get through this chapter too.
Take it one day at a time.
Ken