I have studied your case
As per your symptoms there is possibility of malabsorption syndrome
which can be confirmed by fine aspiration cytology [FNAC].
I will advise to check your B 12 and Liver
function test via blood.
As you are losing your weight there is possibility of malignancy so I will advise you to do PET scan to detect any abnormality in early stage if your FNAC comes normal.
Till time continue your medication.
Hope this answers your query. If you have additional questions or follow up queries then please do not hesitate in writing to us. I will be happy to answer your queries.
Wishing you good health.