Morning cortisol should be at the TOP of the range. A 24-hr saliva test will give you a better picture of your adrenal fatigue. Think of a hill that slopes gently down to the bottom. That's what your cortisol should do. It should be at the top of the range first thing in the morning and near the top at around noon and lower in the early evening and at the bottom at midnight. Are you taking ANY adrenal supporting herbs like licorice? How about isocort? In the end, it may not be enough, you'll probably need some rx strength hydrocortison. Once you get your adrenal supported, the pounding heart, shakes, low blood sugar, emotional instability will get better (especially the rages).
I had a 24hr saliva cortisol test last November and my cortisol levels were very elevated: 7am-8am 37 (13-24nM); 11am-Noon 52 (5-10nM); 4pm-5pm 15 (3-8nM); 11pm-Midnight 4 (1-4nM). I was a MESS. I couldn't sleep at night. At my worst, I woke up every hr. I was tired during the day, took 2 hr naps daily. I had no patience and would get into screaming matches with my 11yr old every morning getting her ready for school and in the evening because she wouldn't get her homework done or get to bed. Plus, my heart would pound every night when I got in bed, everytime I came back to bed. I'm sure you can relate to some of my symptoms.
PS. On my results from Diagnos-Tech saliva test, stage 6 of adrenal fatigue is High DHEA. Valerie, moderator on the NaturalThyroidHormoneADRENAL yahoo group can help you find a doctor for your adrenal fatigue. She can also help you interpret your results of your saliva test. You really need the 24hr saliva test in order to know what is going on. You need to find a doctor who can help you ASAP. Valerie, at one point was worse off than you are and she got better by supporting the adrenals with hydrocortisone.