Cushing's Disease Help

I'm a 20 year old female and from recent blood tests it is suspected I have cushing's disease. First it was thought I had PCOS as I had raised testosterone but all my other tests and scan came back normal.

I match many symptoms of cushings and my cortisol level came back abnormally high, and I am having more tests to check for cushings. I have also just found out my cousin has raised cortisol but she is only 15. I have heard it can be gentic but is very rare so does anyone have any idea what else it could be?

Also does anyone know if it causes infertility if treated. I would like to have children in the future but I'm now worried this won't be possible.

Thanks in advance, very worried :)