My 7 year old was diagnosed with tonsilitis last Sunday given antibiotics 3 days later severe central tummy pain near belly button ..vomiting..pale ..lethargic ..not eating..still intake of fluids..feeling sick constantly..back to doctors was told it could be masenteric adenitis ..3 days later still no change vomiting has stopped but still feeling sick constantly ..getting worried as no improvement should I take her back to see doctor