Can you develop strictures after 3.5 years? or is it hiatal hernia?

I had an CT done in June 2014 because of car accident, they noted that I had mild hiatal hernia.  My surgeon said I didn't have that back in 2011 when I had bypass done. 

Sometimes after eating, food would come back up accompanied by chest pain but doesn't last long.  

What do you think it could be? 

I will put in an email to my surgeon and ask.

I just had my R&Y done last Tuesday. My Dr. told me that I had a small Hiatal Hernia and he doesn't do anything to repair them unless  they are really big and troublesome.  Also, they say about 40% of people have these. My Mother had a really large one, and depended upon what she ate woud it give her problems. I have also heard that its easier to live with it than to have it repaired.

You can develop a hiatal hernia at any time. I don't know about strictures.