What tests to ask for?

Had a blood test at 9.30am and got a reading of 18nmol/L cortisol and 12.8 IGF-1.

I'm lucky enough to have an appointment with an endocrinologist soon, suggested by my GP, but i saw them once before for something else and they're awful. I had to entirely direct the treatment myself or nothing would get done.

I'm new to this - what do I need to ask for? GP wasnt sure unfortunately

I saw an acth stimulation test was suggested on Google, is that it or is there other stuff i need to get looked at?

I'm pretty sure i know what had caused the problem, I've had high pressure for years so maybe my brain didn't like that and it's affected things. I do know I don't have a tumour form recent scans so that's something