What is Hashimoto's encephalopathy?

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Q. I am a 28 years old man who has been diagnosed with severe hypothyroidism eleven months back. My TSH was 110 and anti TPO was 470. My treatment was started immediately but I started getting phases where I spoke softly, walked slowly, had fatigue etc. The doctor thought that these symptoms will go when my TSH levels become normal. Though my TSH did return to normal but has again increased to 43 (on a 100 mcg dose of Thyroxine). To bring it under control, my dose was gradually increased to 150 mcg. All this while my symptoms - headache at back of head, eye floaters, slow speech, slow walking, loss of coordination of limb movements, etc persisted. I recently consulted some neurologists and they are confident that I have a rare complication known as Hashimoto's Encephalopathy. My EEG tests shows slowing of waves. They decided to put me on steroids but before that I got my antibodies checked once more. Now my anti TPO is 16430. The lab had to recheck the value thrice because they felt it was too high. but the level is now confirmed. Why has my anti-TPO level gone up drastically and how can it be cured? While I may have mild encephalopathy (as severe encephalopathy would have lead to seizures, convulsions etc), why do my symptoms worsen when I am upright and are relieved when I lie down?