Prolactinoma Support Group
A prolactinoma is a benign tumor of the pituitary gland that produces a hormone called prolactin. It is the most common type of pituitary tumor. Symptoms of prolactinoma are caused by too much prolactin in the blood or by pressure of the tumor on surrounding tissues. Prolactin stimulates the breast to produce milk during pregnancy. After delivery of the baby, a mother's...

It's good that your PRL levels went down. I haven't tolerated Bromocriptine as well and it seems my prolactin levels go up
& down and then average out but have yet to come close enough to normal range. Anyway, my endo has had me tested twice for Cushings Disease. Cortisol can be tested 2 ways in the blood & in the urine. The urine test also tests the Creatinine. At first I was told this level was high then they called back and told me to disregard everything was fine. I am borderline?? or Could it be that someone inexperienced was reading the results? i don't know...we are still awaiting the results from the second most recent set of test.
Here's some resources that I found useful.
Cushings info: http://endocrine.niddk.nih.gov/pubs/cushings/cushings.htm
Understanding lab tests:
http://www.labtestsonline.org/understanding/analytes/cortisol/test.html
Also stumbled accross on YouTube dntuevr85 who speaks candidly about her experience with Cushings Disease.
Good luck, Be well.