Hi friends. I've just stopped my t3 and increased my t4 to make up for the shortfall. The reason behind this crazy idea is that I want to see a true reading of my TSH. We all know that t3 suppresses the TSH. My blood tests always come back normal. I have been so breathless since last year and the breathlessness has got so bad that I'm on night oxygen and now my doctor has prescribed mobile or ambulatory oxygen. In seven days time I shall have a blood test to see what is going on with my thyroid. In the meantime, I am sleeping 12 hours and the depression has started, I think as a side effect of stopping the t3 or just the adjustment. I've been waiting months for a pulmonary test. My doctor has written twice to the hospital, now another doctor is also writing and a cardiologist requested pulmonary testing back in Febriary 2016. So, whether my breathlessness is due to too little thyroxin, heart failure or copd is anyone's guess. Do my circumstances sound familiar to anyone?