Welcome back. Being back in the States after a deployment like that can be quite the roller coaster. I know that it felt very strange for a little while.
As you may already know the Post-Deployment Health Reassessment (PDHRA) Program (DD Form 2900) is a program mandated by the Assistant Secretary of Defense for Health Affairs in March 2005. The reassessment is scheduled for completion before the end of 180 days after return. There are service specific wickets that must be completed. This assesment is crucial to identifying any issues that can become problems in the short and long term.
http://www.pdhealth.mil/about_dhcc.asp
I also suggest getting the book "Downrange. To Iraq And Back". The book is about Post Traumatic Stress Disorder and for veterans returning from Iraq & Afghanistan. The book is free of charge to Vets & their families as a service of The Veteran's Action Project (
http://veteransactionproject.org/).
This book helped me out a lot.