Offering you hugs. I'm so, SO sorry for your loss and I pray that God gives you and your girls strength to carry on.
I don't know this from experience, but I feel led to tell you it's ok to not be strong. It's ok to let loose and mourn. Let your relatives hold you up during this time. You owe it t yourself to mourn, that way your healing can start.
May the Lord wrap you in his everlasting arms and rock you, his baby, to comfort.