I am having bouts of extreme tiredness, coming on quite suddenly, which are accompanied by shakiness and weakness. No muscle weakness nor paralysis. No inability to move aside from feeling like I m too tired to do so. No pain. BP and glucose are normal during these episodes. They last for several hours, sometimes 1-2 days, and I am tired afterwards. Bloodwork shows a gamma globulin of 48, which is below normal. Everything else looks normal. I have a history of mild anemia.