In my opinion, 10mg to 5mg is too fast of a drop though I know many doctors would disagree with me. Dizziness is a symptom of adrenal insufficiency and it's not that uncommon with such a decrease. I'd definitely give your doctor a call and see what they think.
Thank you David for the information. I almost called the dr but the dizzyness went away. I knew that this is the dosage that might give me problems so I am staying watchful. This info helps me to know a bit more of what to watch for. I will be glad when this week is over!