Thank you for your advice.
The urodynamics test tests bladder function only and to my layman's knowledge, does not test the adrenals - only an ACTH stimulation test works for that.
However, having problems after giving birth makes me think that you may have Sheehan's syndrome - so I really would talk to a good endocrinologist or a pituitary endocrinologist and let them know about what is going on and let them do some testing. Other hormones may have been effected as well.