Lymphadenits tuberculosis. Mg or not?

Diagnosed with extra pulmonary tuberculosis in lymphnode (armpit) and has been on R Cinex 450 , ethambutol 800 and pyrazinamide 750  for 2 months..earlier lump size was 3.7×3.5×1.2 cm after 2 months of treatment it is 2.7×1.5×0.9 cm ..so it is reduced ! but i took second opinion and that doctor says as per your weight (61 kg ) it is under dose and you should take Rcinex 600 .. while the primary doc says rcinex 450 is ok ! so I am confused whether i should change my current potency 450 mg or not ? secondly I am highly nauseated and indigestion is there  since few days(have to pass stool more thn three times a day ), unable to eat well .. Already done with LFT twice and abdomin ultrasound as well..both are normal . already taking antacid twice a day ..and weakness also there ! plz guide me .