You are a patient of subacute hyperthyroidism
watercress contains more vitamin C
than oranges, is higher in calcium then milk, has more iron than spinach, and contains the same protein per calorie as chicken breasts.
so you are wasting your time with water cress juice as it doesnot have neomercazole or any antithyroid activity
there are other options :
take neomercazole to be taken once daily
stop all the neomercazole and get tsh
after 2 weeks
get a radioiodine ablation of your thyroid but your disease is not that advance.