I am so grateful to have seen all this. I just googled mesenteric adenitis after getting a possible diagnosis of it with my 11 year old son. He's been perfectly happy/healthy until 3 weeks ago yesterday when he started with a mild fever, vomitting, nausea and intermittent stomach pains. We took him to the ER assuming it was appendicitis, and after an ambulance transfer to a bigger hospital by the dr who also suspected appendicitis, we had an overnight stay. They did 2 blood tests, and 2 ultrasounds (first one showed slightly swollen gland/node in abdomen, but never mentioned on second) as well as many physical exams. They decided it was either grumbling appendix (unlikely though) or MA. Sent us home the next day after an IV drip to rehydrate him (they wouldn't let him eat/drink nor did he have the appetite) saying to give him Tylenol for pain and come back IF it progressed. So after a few days the pains got lighter, and he went back to school, although they never fully went away. Then 2.5 weeks later on the Wednesday just passed, school called asking me to pick him up as he was worse. Again, pains a bit stronger, no appetite, nausea and shaky legs. I should also mention all pains from the get go were in the lower right abdomen. So back to the hospital we went after fetching my other 4 kids from school/home (toddler). Again they triaged him and took him into the ER. New drs assessed him and drew blood and ordered another ultrasound. Both came back fine, as did urine test. So again, another overnight in hospital with no food or drink and he developed a severe headache. We assumed it was due to lights/lack of good/ drink. They gave him Tylenol and said again, likely MA, go home and wait it