1993 Hashimotos, sub-total thyroidectomy
1993-1995 Unable to get stable test results
1995 450mcg (Yes, four fifty!) levothyroxine daily; T4, T3 all just in bottom of range, TSH slightly high
1995 - present 450mcg daily, annual tests as above
2010 Jan diagnosed with ER/PR neg, Her2 pos breast cancer
2010 Mar-present on chemo (FEC-T)
Test results show TSH of 55, T4 + T3 well below range
Felt fine on 450mcg until chemo, no obvious side effects of such a high dose (normal weight at 8st 10, 5' 3'') ...Oncologists have no answers for high TSH, GP has no idea, endocrinologist just insinuated I wasn't taking meds, which is ridiculous...been doing so at same time every day for 17 years!
Known interactions between chemo drugs and thyroxine? Why do I (normally, when not on chemo) need 450mcg to get T4 and T3 just in range? (T3 sometimes below)? What to do now? Up dose even more because of current high TSH? Having lots of 'hypo' symptoms but hard to say if these are thyroid or chemo related. What to do next? Not keen on taking even more levothyroxine...NHS failing me badly here...