If I have deciphered your information correctly, your patient is now in a hospital and is not taking any food. Has diagnosis
with h/o brain injury
needing VP shunt. Has had a recent infection which was treated.
I presume that the patient is elderly because of the diagnosis of Dementia.
Has the patient been treated for depression with antidepressants?
Is the patient now in such a state that he/she needs urgent treatment?
Is the patient's inflammation markers come back to normal?
There are so many questions like these and would need a complete psychiatric assessment. Is there a psychiatrist
Online assessments do not help these kind of acute or severe cases. Please involve a local psychiatrist as soon as possible, if not already done.
Hope this helps.