I'll let others reply to you about T4 / T3 dosing, but just a thought - some of your ongoing symptoms (no appetite, heart rate etc) might be cortisol related? Here's a blog post on symptoms and why this could be so.
(I've just started T3 and my cortisol levels have dropped considerably - Am just trying to work this through this myself. T3 taken during the day apparently wears off at night causing not enough T3 to make the cortisol - or so I'm told)
Content on HealthUnlocked does not replace the relationship between you and doctors or other healthcare professionals nor the advice you receive from them.
Never delay seeking advice or dialling emergency services because of something that you have read on HealthUnlocked.