I bet you want to wrap them up in cotton wool and comfort their pain but realize this ... you are hurting too, all these feelings you are feeling are normal and very real. I remember struggling trying to be the strong one for my children but kept hitting that black wall. I found talking honestly and letting my children see my emotions helped not only me but my childrens path on the grieving process.
Be kind to your self and take little steps... I'ts still very early days x