I am hypothyroid , with extreme fatigue and sleepiness i sleep for 15 hours a day , My thyroid function is perfect according to the blood results , i have been hypothyroid for 4 years . My fasting and post prandial blood sugar is normal , hb1ac 5.6 , howeever my fasting insuling is bit elevated but post prandial insulin level is skyrocket , it is 190 while top range for post prandial in the test is 20 . I feel extreme thirsty and sweat very much and urinate 4 times in the night . I read online that high insluin level in blood can cause fatigue and brainfogg just as i experience now , I had done all tests thats related to fatigue :- sleep analysis feritin , vitamin d , magnesium , electrolytes , cortisol etc . so i want to try metformin to lower insulin . can anyone tell me how much time does it take for metformin to effect the insulin level . and i dont see major sideeffect caused by metformin . what do u guys think . i was overweight , now i reduced my weight to the normal range with dieting and exercise still my insulin is high . every help will be hugely appreciated i am currently writing this with huge brainfogg and sleepiness . sorry if i made grammar mistakes