My endo switched me from 50mcg of synthroid to 15mg of Armour. It costs a lot more to get and I'm noticing I've been having more decent days than usual. However the day can go from decent to really bad in no time at all, wondered if I need to increase this dosage every 6 weeks as with synthroid until I feel better? I think 15 mg of Armour is a small dosage and the doctors here in America are reluctant to start any medication at a high dosage because they are basically handing out synthroid and hoping it works. Do I need to adjust my dosage according to how I'm feeling? I've been on the Armour for about 3 weeks. Also, the brain fog everyone speaks of... Does anyone else describe it as lightheadedness and dizziness? An inability to focus your vision on something? Because the dizziness and feeling in my head hasn't ever stopped since this started. I want to make sure it's normal and actually from the thyroid. Otherwise I need to make sure it's not something else causing it. Sometimes I can be driving or sitting at work and the world feels like it just gets smaller and my head is heavier and my eyes just want to close. Is that usual?