I am new here. I am 7 years on T4, last two on 200 mcg of it. I don't feel well for years. Recently I decided to try self medicating with T3 I bought online without prescription. I need advice how much to lower my T4 and how much T3 to add at the beginning? I don't have any recent test done except TSH (my GP hasn't tested me for T4 and T3 for 2 years). My TSH is 4.2. She says it's fine. But I don't feel fine. Please help.