Feeling tired and fatigued and don't seem to have sufficient energy throughout day. besides just getting more sleep, are there any exams to diagnose?

Several possible: A thorough history (Dr interview) is the most useful intervention as this helps to narrow things down vastly. Most blood tests for this very common complaint are a bit of a shot in the dark unless there is a reason to perform them. Do you snore? A common cause for this complaint is sleep apnea. For more info re blood tests: http://www.bpac.org.nz/resources/campaign/tiredness/tiredness_bt.asp

Labs: Reasonable labs to explore would be cbc, electrolytes, blood sugar, tsh