You arnt wrong,you probably are in shock,many of us are in the first days,and yes pain,anger and guilt,even when there is nothing to feel guilty for are all part of grief.I understand you don't want to upset your husband and especially children,but the children are probably upset anyway,and its quite OK for you to explain to them that you feel sad.Not now,as its such early days,but one thing people do find helpful is to create a memory box with the children,put photos in or get them to draw pictures etc.In doing that they get the message that its OK to talk about her,and you start to remember the whole of her life not just the end of it,and its those happier memory's that in the end,carry you through.Even if the children are too young,its something you can show them when they are older so they will know who she was and carry those memory's forward.As Emz said we are here ,and will be for as long as you need us.