you have not mentioned which blood test
have been done.
Probably it is IgM anti TB test.
The two blood tests are not enough to confirm tuberculosis
Mantoux can indicate that there has been contact with tuberculosis ( may be in remote past or recently )
IgM TB tests are highly unreliable and has been banned by Government of India.
forecox tablet contains 4 drugs and they may have occasional side effects like reddish colouration of urine sweatetc , nausea , vomitting , joint pains
It is mandatory to take drug 'if she has tuberculosis'
there are other brands with same drugs
also the 4 drugs can be taken as individual tablets
if your wife has tuberculosis of lungs it can spread to you through your breath , chances for which are increased in intimate relationship.
But after taking proper dose drugs for 2 weeks patients are unable to spread disease
Finally . my advise
Consult a gastroenterologist
( DM GASTRO ) near to you , who may decide to get an ultrasound
and diagnose what is your wife's disease