Is the rash red marks that don't fade when you press them with a glass (or anything else you can see through)? If it is then it sounds like meningitis and you need to get him to hospital now.
it could be fever or stomach flu
swelling of lymph nodes fever rash (i.e raised bumps) feeling of discomfort exhaustion diarrhea
Strawberry tongues are most ofter associated with Kawasaki disease, toxic shock syndrome, and scarlet fever.
Fever bumps / blisters are caused by the same contagious virus that causes cold sores which is oral herpes (HSV!).
Hypertension can cause vomiting, diarrhea and fever.
I hope you have shown her to a doctor. While any fever can cause headache and vomiting the combination of fever, severe headache and vomiting should be taken seriously.
To avoid food poisoning - which could lead to diarrhea, vomiting and fever, or even death if severe enough.
Could be strep throat (Group A Streptococcal). Has he had a sore throat, runny nose or fever? My son had pimple like bumps around his mouth and nose when he had strep throat. They sound like pimples. If they aren't maybe a rash.
Some with excessive diarrhea and vomiting
it could be FMF which is a fever that runs in family especially Mediterranean area characterized by fever not more than 38C for up to 2-4 days recurrent with abdominal pain mimic appendicitis or cholecyctitis
vomiting and slso vomiting blood fever jaundice headace coma delliruim red eyes face and tounge seziures Arrhythmias, bleeding hemmrouge decreased urination
Fever Vomiting Intense headache Stiff neck