i would definitely suggest finding a counselor to help you with this. It sounds like you are experiencing something called derealization, which is an anxiety symptom. It is also VERY TREATABLE.
How old is your child? have you shared how you are feeling with anyone around you? Perhaps they can help you find a counselor who has experience treating postpartum mood disorders.
I wouldn't hesitate to find help, the sooner you reach out the sooner you will recover from PPD/anxiety.
Postpartum Support International is a great starting point for finding help locally:
http://postpartum.net/
Please check back in and let us know how you are doing.