Hello I am a 36 years old male use to feel intermittent lethargy for last 2 -3 years that subsides within 3-5 days. During that period I also feel mild sole sweating and sometimes tongue dry feeling . I did CBC, TSH,renal function test,ECG,ECHO,LFT all are normal but my HBA1c level is 6 done two months back. So what is the cause of that intermittent weakness with sole sweating? Is it normal or any measure I should take?