Definitely discuss with your doctor. There could be a very simple "fix" to free you to enjoy your baby. Take care.
Postpartum depression is a WAY more common thing then we are led to believe. Talk to your doctor and see what options you have to cope with the problems you are having.
You should discuss this with your psychiatrist as sleep disruption of any kind can be a sign that mood swings are worsening and if it affects your ability to raise a child then you ask them what might be some good coping ideas.