Have Headache, High Cortisol, Thyroid And Pre-diabetes. What Test Or Treatment Should Be Done?

Question : I have been sick for over a year now. My doctors can't diagnose me. So far I have cushions,high cortisol, thyroid desease, and pre-dibetes, along with a lot more symptoms. Now I broke out in shingles. My family and I think its my pituitary gland. So far that's the only thing that hasn't been checked. I have headaches, bone pain, I can't hardly walk,I've gained weight on my face,neck stomach behind ,arms and hands. It would be nice to get your opinion. I go to my neurologist on Tuesday. He will send me for blood work, and possible MRI of my head. So what does it sound like to you ??????? Do you think its my pituitary gland? That's my question. It is so frustrating that pretty much everything comes back negative. Some doctors treat my like a hypochondriac.I'm very sick and I know my body and its not gonna hold up much longer . I really hope you can give me some help. At this point I am willing to fly to India or anywhere I need to go. This is REALLY LIFE OR DEATH. I promise. I have three kids and three grandbabies that really need me. I'll go on T.V. or whatever it takes to save my life. Thank you and God Bless you.