I keep Cushing's and Addison's straight this way:
I just remember that they are both diseases caused by hypo- or hypersecretion of the Adrenal gland. If you remember that the adrenal gland secretes corticocorticoids (I always think "sugar") and mineralcorticoids (I think "salt"), you can pretty much figure out the two diseases of Cushing's and Addison's.
Just remember: Cushing's=HYPERsecretion=hyperglycemia (increased sugar), hypernatremia (increased salt) so therefore--hypokalemia, hypocalcemia
Addison's=HYPOsecretion=hypoglycemia (low sugar), hyponatremia (low salt), so therefore = hyperkalemia, hypercalcemia
Once you remember these ups and downs of the two diseases, you can pretty much figure out the disease symptoms. You also have to remember that the adrenal gland also produces androgens (sex hormones) which leads to hirsutism (male and female) and male pattern baldness (females) in Cushing's.
I take the test tomorrow morning at 9 and those are basically the only two diseases I feel good about!
Now ask me a question about meds and I'm toast.
Good luck on the test!