Hiya,
i am sorry to hear of the loss of your child - I have never experienced a miscarriage myself but I understand that it can be a very traumatising event to go through.
I believe that it is completely normal for you to be still grieving after three weeks of the miscarriage - as individuals we all respond differently to loss in our lives (different rates of grieving and the use of different coping mechanisms to deal with the loss).
Have you been offered any therapy at all?
Have you talked to others that are in a similar situation as you are? - if not it may be of help if you use a forum based on miscarriage. Or you could speak to someone from the miscarriage association through a method of communication of your choice (email, phone etc). -
http://www.Miscarriageassociation.Org.Uk/m
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i'm unsure of how long it takes for your hormones to return back to their normal state - there may be a possibility that a change in your hormones are also affecting the way you feel at this point in time.
I wish you and your family all the very best for your future,
take care.