I dont tell my doctor anything about dosage, all i know is if i take less than 100mg thyroxine daily, i go underactive after a few months. My doctor knows nothing about thyroid problems, i have to do it myself. You have Hashimotos disease, i have no thyroid so its different i suppose. Mine used to be very overactive and i became very ill, had a mild heart attack and put on beta blockers, so i know that when i take too much thyroxine i have the symptoms of overactive thyroid, which in my opinion is alot worse. Back in the old days, i was extremely nervous, depressed, heartrate 180 per minute, uncontrolable diarorea (spelling) sweating, fatigue and muscle cramps, everyone thought i was going insane, including myself, also my neck looked like it had a rubber tyre around it and my eyes were popping out, i just caught it in time otherwise i would have been disfigured. Now if i get underactive i go lethargic, depressed, constipated, put on a little weight, chest pains etc.