My husband died four months ago after an 18 month battle with cancer. We had been married 38 years and had no children. My parents both died within the last six years. I was the primary caregiver for my husband and my parents, with my sister’s help. My sister has a husband and three children, so she had a life to step back into completely. I’m going back to work October 1st.
You probably realise that eventually you will have to force yourself to take up a new interest, but give yourself time to get there. Can you do something that you won’t have to plan? Decide to go to the theatre or a movie at least once a week? Go out to eat at a new restaurant every week? (Take a book if you don’t want to be bothered by other people)? Offer to take one of your sister’s children to a regular activity, and make yourself talk to other parents there?
Good luck, and be kind to yourself.