I'm very sorry you've lost your husband so suddenly, Seastar.
I've recently lost a friend in sudden, shocking circumstances and whilst that doesn't compare in any way to losing your husband, I've been told that the effects of the shock can last at least six months and as long as a year or maybe more so it's really no wonder you're crying and unhappy.
I think you're on a hiding to nothing with your family. Even if relations were thawed, would you ever fully trust them again? I don't think I could.
When you say you're isolated, do you mean physically, as in living in a remote area? If so, would you contemplate a move to somewhere with more to offer in the way of a social life? There are lots of things available to do nowadays and it would bring you into contact with others and where you might find friends. Even one or two friends can make such a difference to life. They don't need to be bosom buddies, just seeing a familiar face on the High Street can make your day.
There are also bereavement services available, and you might find it beneficial to talk to them. Other Gransnetters, sadly, have experience of this and I am sure they would be very willing to point you in the right direction.