am very sorry for the loss of your mum. As Tim and flowerpot have said in their thoughtful and supportive posts, 2 weeks is a very short time.I know it may seem like a long time to you but this is thery eraly stages of grieving.
The thing about grief is everyone can experience it in any way and there is no use by date. Just go with your feelings, cry, rest, talk, write, do whatever you want to and whatever helps. The first three months are very intense and difficult. Go with your emotions and don't worry about being strong you are strong as strong people show their emotions and by showing your children how sad you are they can see that is ok to display their emotions. Repressing grief can lead to problems down the track. Grieve in your own way.
My mum died nearly 20 years ago and even though I do not experience that intense grief that you are now, I still have the odd cry and I miss her.
Take care of yourself. Write here when you want you, you are not alone and there is support here.
Thanks for writing this thread and sharing your emotions honestly.