No kidding! Gosh that never happens to me...
If you've got high RT3 generally the way to clear it out is with Cytomel. But it's more important to find out what's causing you to make the RT3. This generally happens when you're under stess, either a stressful event or because your adrenals are fatigued and either making too much or two little cortisol. (I've got adrenal fatigue and high RT3).
Are you on thyroid hormones right now? What are you taking? Have you ever tested your adrenals with a saliva test? The Cytomel might help you but if you don't get to the cause of the problem I don't know if it will keep working.