Definitely there's some sort of digestive and/or G/I related issue. A Celiac test cannot rule out gluten sensitivity.
(Non-Celiac Gluten Sensitivity)
It also cannot rule out gluten cross re activity- a reaction to foods mistaken for gluten because of similar molecular structures. Apparently 50% of people sensitive to gluten are also sensitive to dairy.
You may want to download Dr Coca's Pulse Test for free.
Within a week you can test all the foods and drinks ingested
while taking his pulse (a digital blood pressure monitor is what I use) at specified times throughout the week.
The download also gives you the instructions how to interpret
the results, so you will know which foods and drinks are causing allergies or sensitivity.
Other things to consider checking are:
Gastric acid levels, Pancreatic function and enzymes,Candida yeast infection, Leaky gut syndrome, iron and other nutritional deficiencies, lactose intolerance...
Feel safe to try pediatric probiotics of high quality and see if this helps after a few days.
You can also look into demulcent herbs, which help soothe and protect inflamed internal tissues.
A Holistic Pediatrician, would be the type of health professional I would take my young child to.
http://hpakids.org/ for more details.
I hope this helps,
Thank you for your response! I'm taking him to his new regular doctor, I just wanted an idea of what to expect or ideas of what it could be. It has me worried, especially with him starting school this August. Thank you again! :)