Laura, I never want to eat after long runs either. I use not be able to at all because my stomach was so uneasy. I started taking in fluids and Gatorade on a more systematic and patterned way...whether I felt I needed it or not...and that helped a lot. Still, I never have much of an appetite until the next day. I do force feed myself because I know my body needs it. I just make sure that the forced food is #1 very nutritional and #2 things I know my stomach can handle.
After my Endurox, after I am all cleaned up and ready for a meal, I'll have oatmeal with fruit mixed in, some egg whites and maybe a bit of natural peanut butter. This is also my pre long run meal. I make sure I get spinach and romaine salads with dinner and a huge side of brocolli.
Your body need rest and nutrition after a long run to repair and get stronger so that your next long run will be easier...and it will be.
The better care you take of your body, the better it will take care of you! Give it what it needs and it will do what you ask.