Some years ago I was feeling increasing pressure on my windpipe. First the GP totally misdiagnosed this but eventually it was obvious that I had a slowly growing goitre. Thyroid tests normal but I was referred and despite initial tests it turned out to be cancerous and two operations later my thyroid glad was removed and I received radium treatment. Rest assured that all the treatment was relatively easy and pleasant although perhaps frightening and worrying for my family. Since then I have had increasing side effects from Levothyroxine although I should consider myself lucky to be alive. Often wondered if Thyroid cancer might be caused by early microwave ovens.
There really needs to be better research into Levothyroxine alternatives, I did see a study a while ago.