I had a long battle with getting my diagnosis.
I just knew that there was something weird going on and my GPs couldn't explain it and only after having a hypo in the doctors office, I got an appointment with my endocrinologist.
Once I started doing the tests, which I was quite comfortable with because at last someone was looking at what my body was doing.
The knowledge that I gained from those tests and how I felt after was well worth it.
The biggest and really eye opening experience for me was how I felt during and after my prolonged fasting test. That was because at last after so many years, I now felt normal! Having no carbs for days cleared my system of insulin and normalised my bloods, also the extra surge of energy I had been given because I wasn't relying on food for my energy. I had gone into ketosis.
Tests are a means of sifting through the evidence, to ascertain diagnosis.
Knowing is far better than not. In my experience, knowing how to control this condition personally because most of the medical community wouldn't and couldn't have the knowledge or know how in how to deal with it.
If you asked any endocrinologist, you would probably get the you must have carbs because of the brains needs, there is enough in vegetables, to do this, you don't need the carbs that spike and create insulin.
It's logical!
Don't worry too much about the tests, they will help you.