very tired and moody after thyriod surgery

I had my right side of my thyroid remove back on January 31, 2013. I felt ok for a couple of week after surgery. Now I am very tired and moody at times. I find my self sleeping at different time during the day. I primary care say that there is nothing wrong with my T3 and T4 level. he thinks it might be sleep apena but I when I am a sleep at night nothing can wake me up. I have rad my article that sat that it might be or could be the thyroid level causing this issue. I need some advise on this...