Thanks for posting your query.
With the available described symptoms, there may be possibility of tubercular infection
Positive montex test, low grade fever
, and eight loss suggests the diagnosis.
You should consult with internal medicine specialist and should go for thorough check up.
You should go for complete hemogram, erythrocyte sedimentation rate
, chest x ray
You should also go for Quantiferon TB gold: highly specific for tubercular etiology.
Dr. Mayank Bhagava