Another option you have is to order the test yourself. You may or may not get reimbursed by your insurance company if your doctors don't order the test, so check with that before you test, unless you don't care and just want the test done:
www.truehealthlabs.com/Salivary-Adrenal-Fatigue-Stress-Test-STTM-p/dt_sttm_4cort-dhea_flexm.htm There's another lab that does this test that you can order yourself as well, but I can only remember the one, sorry.
Remember that we all need to start off on very low doses anyway, and we titrate up carefully and slowly to find what our tolerance level is - whether pharma drugs are used or natural products. Of course you need to always be aware of where your sensitivities lay, but many of us find out that as our bodies heal, our sensitivities lessen.
What works for one person doesn't mean it will work for another, so pick one that you are most comfortable using and move forward slowly, carefully until you either see improvements or herxing. If you start herxing, back down on the dosage and increase the amount of detoxing you are doing.
It's all just one step at a time. Every long journey starts with stepping outside - then putting one foot in front of another. That's a pretty simplistic way of seeing it, but it also has a lot of credence.