I have a question about Mesenteric Lymphadenitis in 10 year old child.

[CaseyWhit]

My son had sudden onset symptoms causing a STAT CT scan to rule out Appendicitis. It did rule it out.
They found Mesenteric Lymphadenitis present.
No infection has been found in the blood stream, in fact only signs of inflammation. Other test are being run by Pediatrician, but still await results.
4 % of body weight loss in the past week.
The pain just doesn't seem to want to subside.
Do you have any thoughts on how I can be more proactive to help him??

[CaseyWhit]

Let me add.. He had no respiratory issues previous. He has not been sick in well over 6 months.