I'm so sorry, for all your losses.
I think the key is just to honor your feelings. I buried myself in my work after my husband died, and at the time it seemed like a good idea to have a distraction -- and my employer certainly encouraged it. But the extra stress from working all that overtime severely delayed and compounded the grieving process for me, and unfortunately it becomes much harder to resolve later on.
So be really good to yourself in the first months, and if you do not have a whole lot of social support at the moment, or just could use some more, definitely consider joining a bereavement support group. It helps to spend some time among people who understand. My mother-in-law did this and she found it really helpful.
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vonmoxie