Did you get a copy of the tests? ALWAYS, ALWAYS get a copy of the test. Never let the doc or nurse fob you off with "everything was normal". I am assuming that the 24 urine collection was for FREE cortisol. Was It? Was a SMAC done? Do you have the results? Were your B vitamin levels tested?
Sadly, unless you have a rare and exceptional physcian, you must be proactive in your diagnosis and treatment. Many physicians don't really care how you feel as long as you aren't going to keel over and die before paying the bill.