Hi janieg
In my case both symptoms & testing. I was prescribed progesterone (and oestradiol) after severe onset menopausal symptoms when I was diagnosed with Addison's Disease at age 50 (in 2010). Non-functional adrenals = no hormones.

I was tested for hormone levels prior to starting and they were minimal. I'm now into 9 wks tapering off and so far the effects have been minimal - slight headaches, very dry skin, some extra nausea and fatigue but nothing like when I tried to stop 2 years ago. Touch wood it continues like this as it is time to quit them.