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This is Dr. David
T4 (thyroxine) Free (serum) normal range is 0.8 - 1.8 ng/dL or 10 - 23 pmol/L
T4 (thyroxine) Total (serum) normal range is 4.5 - 12.5 µg/dL or 58 - 161 nmol/L
what T4 level are you talking about? T4 free or T4 total?
if your TSH levels are 0.51, then most likely your thyroid hormone levles are not causing your symptoms of feeling blahs.
did you get your potassium levels fixed? abnormal potassium levels can take severel days or weeks to supplement to get your intracellular potassium levels back up.
did you actually have heart failure?