I too am having the same problem after being diagnosed with hypothyroidism about 4 weeks ago. I am on .25 mcg of Levothyroxine and am experiencing severe fatigue and weight gain as well as feeling all around â€œsluggishâ€. I, too, am at a job where I need my mental facilities intact. I find myself falling asleep at 9:00 in the morning after being at work for an hour. I have a call into my physician about adding Cytomel to my Levothyroxine.