I started my levothyroxine on 25 micrograms and my endorcrinologist increased it to 50 mgs in December. Some of my symptoms reversed in that my eyebrows started to grow back, my vision and memory started to improve. However the tiredness has got to the point where I'm falling asleep behind the wheel again. I am so exhausted I can't function. I have a blood test Monday but judging by how long they took with results and meds increase last time I'm worried I'll collapse with tiredness at this point. I can't take sick leave from work as I don't get paid for it. Can I take two 50 microgram tablets in the morning instead of one. Any advice would be great. I have a very healthy diet and I stay as physically active as I can and I dont know what else to do.