This category provides Celiac.com unbiased reviews of various gluten-free foods and products that are available in the fast-growing gluten-free marketplace. Most of the food reviews are for products that are available in the United States.
I have broken my response up to your question(s) into two responses because they are two issues really. .. and to keep any one response from getting too long hopefully.
Many of your sons symptom's can be related to...
Some of the questions you bring up about "seasonal" factors is a good one. ...we are finding the more we study celiac disease that it is not all black and white ...sometimes it can be grey.
Here is some research that...
Here is some good research to be reading up on until your tests in April.
It should answer most of your questions.
It is not medical advice but I hope...