Hi,
Thanks for using ehealth forum. I am glad to help you.
As you describe a weight loss, be sure to speak with your physician about the possibility of tuberculosis first. Your doctor may also check for the possibility of a malignancy as well.
You should meet a general surgeon for this purpose and he will be able to guide you. If the infection is confirmed, then you will have to be put on an alternative antibiotic for another course of time.
Wish you good Health.