You need to sit down with your bank statements and work out your outgoings and income. Not fun I know. You need to work out how much you need to live on. Basically you need to pay council tax, gas electricity water rates, insurance,Your car if you have one. Food clothes entertainment. If you don't have to pay a mortgage or rent you are fortunate. Perhaps don't do it all in one go, but bit by bit.
You might find it empowering. It's very early days. Perhaps you could get some bereavement counselling.
Do you have family to support you?