At times the turmoil in brain is not completely understood even with symptoms and investigations, because marked relevant changes are not there in the investigations. It seems your husband developed all complaints during or after the treatment for Pneumonia
for which he was diagnosed for Migraine
. Now Migraine makes it presence feel generally through symptoms only and it may resemble as a case of Hypertension
or Cervical Spondylosis
also. sever headache with nausea, vomiting, photophobia
, violence, shrieking etc.
The only thing which is dragging my attention more is the drooping of eyelid and metallic taste
in mouth, i think you shall better see a Neurophysician/ Neurosurgeon and then only go for anyother investigations, about which i think nothing much abnormal will be found.
At times it has been seen that the disease plane shifts from one system to another and i guess this is what happened in his case. the disease shifted from respiratory to Central nervous System
, but this could only be said if he doesnt had the Headache and all symptoms earlier in his life time.
You can also consult a Homoeo Physician because Homoeopathy also has good results.