I have had recently tried a low carb diet for six weeks, but came off when had palpitations and felt very unwell. My TSH level is 12.91, T4 16, cholesterol 11.8, HDL cholesterol 1.99, LDL cholesterol 9.33. B12, folate and ferritin all normal. Feel very depressed and want to hide in bed all the time. GP has increased my thyroxin meds from 75 to 100.