Bravery,
This is exactly what I'm going through too so I know how you feel. My mom likes to ignore the phone, and when she doesn't answer I sit and stew and worry about all the things that might have happened, which causes me to call frantically over and over again until she picks up. Then when I do talk to her a lot of times I feel worse because she sounds awful and won't get help.
I'm trying really, really hard to break this habit of obsessive worrying, because it doesn't do her any good and is terrible for me. But I, too, am afraid if I don't call I might miss an opportunity to help her.
I feel good about today so far though... only two calls and one conversation.
Good luck to you!