RedRose19---the symptoms you are describing sound like a combination of birth trauma, concern for your daughter, and the unnatural separation from her you have had to experience due to her NICU stay.
Be gentle with yourself. It sounds like all that stress has impacted your emotions and hormones.
Do you have support/someone to talk to/lean on about what you have recently gone through?
I hope your daughter heals and graduates from NICU and that your body and mind reaches equilibrium soon.
Postpartum with my son last year was really hard on my spirit and emotions. It took time, but eventually I started to heal from it all.