After seeing Dr Skinner I added 20mg T3 to my !50 mcg T4 and for the first month I felt as if things were moving, less constipation, more alert, (read a book for the first time in months). I also had more joint and muscle pain but decided to tough it out as I know it often pays to persevere. After a month I added an extra 20mg of T3 and after about 2 weeks I began to feel more tired, a bit jittery, and experienced pain, a dull ache, on the left hand side of my chest. My temperature, which had gone up slowly, only ever made it to 36.9 and for the last 2 weeks has been falling again. I cut back to 20mg of additional T3 but feel exhausted now. I don't understand why my temperature would drop when I was getting the extra T3. Any ideas please. I had a blood test last week which I will post when the results come, but I wondered if anyone has any theory as to why this might happen. Thanks.