Hello and Welcome to 'Ask A Doctor' service. I have reviewed your query and here is my advice.
It sounds like you may have developed a low thyroid condition. You can try treating it on your own but if it is a thyroid hormone deficiency
, it will only get worse until you are treated. Please read about hypothyroidism
I urge you to see a doctor and get tested as soon as possible.
Hope I have answered your query. Let me know if I can assist you further.