It is very common for foods to be fine one day and a huge problem the next
. You are doing a great job there: please don't feel that you are doing the wrong thing.
I really would encourage you to look into enteral nutrition. You can find more information by clicking on the "diet" link in my signature, or by searching for "Writer"s posts, as Newfoundsun suggests. A food diary is also a great idea, and you can find more info on keeping one, again, in the diets link in my signature.
Spicy and fried foods can be a problem for many of us, so it sounds as if you are on the right track in avoiding those foods.
One thing that might work is to cook extra, and then freeze *small* servings of any meal that seems to have worked in the past for your son. With time, he may well get to know his body better, and be able to tell you what he thinks he will be able to eat for a meal, before you cook and serve it.
Lean protein, such as chicken or fish, works well for many of us. A lot of us do very well with mashed potatoes, too.
Here is a good thread started by one of our moderators, MMMNavy, where she asked people to list their safest foods. This might give you some ideas for future meals.http://www.healingwell.com/community/default.aspx?f=17&p=1&m=1669119
Hang in there.
Co-Moderator Crohn's Forum. Medications for Crohn's
~~ Diet and Nutritional Therapy for Crohn's
~~ Dealing with Abscesses and Fistulae