Hypothyroidism, really NEED to fast

the glands on my neck feel/seem puffy, a doctor thought I might have hypothyroidism or adrenal fatigue, I never followed up on it.
My grandmother had it so I might be prone to it.
I need to lose a lot of weight too, but now I want to do a long fast to cure my hypothyroidism.
Would like to try to go a long time if I can. At least 3 weeks or more. I really NEED to do this not just to lose weight now, but get my health back.
Day one has just started...
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