I began to notice an extreme nasty drug - like tiredness just before my period. Now I notice it after the bleeding stops for up to a week though not necessarily every day. I am 43, I have some symptoms of allergy AND Hypoglycemia as well. My sleep is not that great. My occupation is cashier I stand out in some heat all day outside in a Florida climate. I work shift work. I was on overnights for one year and quit that for day shift the last 6 months. I dont smoke ,drink or have ever taken drugs but I consume one to two cups of coffee a day. Hope this helps
In CAES of hypoglycemia lower blood sugar level will affect whole body with sugar thrive.  For any activity any tissue want energy from carboy Chat Doctor.  And starvation of it will result in tiredness.in allergy also there is a