G.B.
Ear ringing (tinnitus)is directly related to low adrenal hormone output. Specifically aldosterone which comes from the outer cortex.
Aldosterone can be tested via blood. Test aldosterone, renin, and electrolytes all at the same time, and do a 3 day salt fast before the test. Usually you would need to go to an endocrinologist for these tests.
Bring this with you to get your doctors referral to an endo:
http://www.naturalnews.com/026096.html
'Cortef' is the replacement hormone and needs a prescription..
If it were me, I'd ask them to do a saliva cortisol test at the same time. (saliva- not blood, blood can give a false negative reading.) It would be likely that if you are low in aldosterone, you would be low in cortisol too..the other hormone that comes from the outer cortex.
The replacement for that is Hydrocortisone and can be obtained either prescription or otherwise online.
Gail