I Have Been On Thyroid Medication For A Long Time,

I have been on thyroid medication for a long time, I am a 61 year old female. Two years ago I asked my doctor to change my subscription to Armour Thyroid. I have been taking 90 mg, and my TSH in January was .006' in February it was .02. He has referred me to an endocrinologist, but I can't get into see him until August. I'm concerned I'm being overdosed, and don't know what to do. He says to stay on the same dosage until August.