Hi op, I hope your asleep now, don't feel guilty being like this, nobody is judging or timing you on how long your grief will last, you are in the very first stages, everybody heals at different speeds.
There are some ladies who will have been far worse and taken far longer to even pull themselves out of bed.
You are strong, in my opinion, doing the ironing, sorting the children out, trying to keep the hurt from them (though I think too strong on this one, let them in a little on your pain, trust them).
Bloody hell if thats not strong I don't know what is, it seems you are expecting to bounce back in a short time. Christ you are human, stop being hard on yourself, and stop thinking too much into the future.
You are a lovely woman who has not hurt anyone , take pride in that, we recognise that quality in you, now start recognising this in youself.