Hi, If I were your treating Doctor for this case of
severe headache and fever under the left rib cage, I would come up with three possibilities:
1.I would first rule out serious conditions as
meningitis.You should consult hi at
neurologist or You can discuss this with your treating Doctor..
2.The second possibility is of Infectious mononucleosis(herpes infection ), causes by EBV,CMV,HHV 6 type. Try having
Acyclovir 30 mg/kg divided for 2 times for 5 days. Diagnosis can be confirmed by
blood test, Ig M,G to EBV,CMV,HHV 6.
3.The last possibilities are of sinusitis(ethmoiditis), GI infection, UTI.
I suggest you for differentiation perform blood,urine tests, stool analyses.
Hope this answers your question. If you have additional questions or follow up questions then please do not hesitate in writing to us. I will be happy to answer your questions.
Wishing your baby speedy recovery and good health.