welcome to healthcaremagic forum
is not working so u need a replacement therapy ie 125 mg thyroxine
so take the tablet regularly and take this as the first thing in the morning ie in empty stomach(it is v. important as food decreases its absorbtion).check TSH
after 3m that will be definitly below 4.idealy tsh will be in b/n 1 to 2.it is better to consult an endocrinologist
rather than a physician/gp.plz avoid cabbage,tapioca and mustard.
hope that it will help you regards