Unimazole is contraindicated during lactation
(breast-feeding). Therefore, I would suggest to stop using it and consult and endocrinologist
If the specialist would indicate that it is a must to use unimazole, then, think to stop breast-feeding and start this medication.
With regards to the medicines you need to become better, the only suggestion is to keep in touch with endocrinologist as we do not have your medical data including your hormones levels and other test results.
All the best!