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High lymphocyte count
could indicate viral infection. This can explain the headaches
. Get her blood count to make sure platelets are not falling much as some viral infections can cause fever and low platelets and high chance of bleeding from mouth, anus etc. Let her eat plenty of fresh fruits and green leafy vegetables as this battle viral infection. Drink plenty of water and keep well hydrated. Get her to check up her eyesight as this can also cause headaches. Also if she has running nose ENT consult to rule out sinusitis
which can cause headaches. If it is severe headaches with nausea it could be migraine for which Neurologist
consult needed. She can take Paracetamol
for pain relief till then.