I am awaiting blood test results. But I know I'm not right. I have been on levothrtoxine 100 mcg since diagnosis 7 months ago. I have felt a decline in my health for about 6 weeks and for the last 3 weeks suffered chronic headaches. Also dizzy when laying down, with tinnitus at times. But the worst if it all is that my personality has changed from easy going to highly sensitive and resentful and too serious. I don't know if its being in pain that's done this or the fact that my iron was low and GP failed to tell me for 6 weeks. I'm now on the iron and waiting to see what my thyroid level is. I joined this site a few days ago because I was at breaking point. If there is anyone out there that has or is feeling like this please share.