You are grieving, your best friend so ill it's natural to feel anxious. There have been some good suggestions on here and you are far from alone.
The advise seems to be seek help, to spend time with children and grandchildren, but not everyone is lucky enough to have them. You have to find interests that you enjoy and you have your friend who needs you.
I am the life and sole of any gathering, but this isolation has got to me, where I live I am the only one alone, they all have someone living with them, I miss my husband so much and in my old life I was always out and about with friendly aquaintances but this has shown me I only have two true friends.
Grief is dreadful, you just try to find a way of living round it because life is prescious and we must carry on.. You are far from alone and I like most people understand your feelings.
Mother of the Groom outfit woes