Addison's Disease Support Group
Addison's disease (also known as chronic adrenal insufficiency, or hypocortisolism) is a rare endocrine disorder. It is estimated that it affects about 1 to 2 in 100,000 people. It occurs when the adrenal glands, seated above the kidneys, fail to produce enough of the hormone cortisol and, sometimes, the hormone aldosterone
Your dosage scheme seems a little off. Mostly, doctors prescribe 10 mg in the morning, 5 at noon and 5 in the evening.
I think that would work better for you, because your body will have more cortisone left during the day.
It also could be a temporary problem. I also had stomach aches not too long ago. They disappeared like magic. Maybe I was doing too much on those days or something. You really need to carefully use your energy over the day and be able to predict very well. That takes time to 'master'.