Feeling defeated and Helpless

I lost my daughter due to medical malpractice a little over two months ago. It's one thing to deal with the loss of her, but knowing she was perfectly healthy and multiple medical providers failed her, makes it that much worse for me. Also would appreciate any advice on how to help your significant other during this time, as I feel very helpless most of the time. Thank you in advance and may my Annaleya Grace Sosa forever rest in peace.