Hi, A few months ago I increased my dose of Levothyroxine from 125mcg to 150mcg as my TSH was creeping up. In January I started to develop symptoms of possible hyperthyroidism (anxiety, weight loss, diarrhoea, sweating, feeling shaky etc). It took a while to realise that these symptoms could be due to the increased dosage, but when I realised I reduced my dose back down to 125mcg with no real affect on my symptoms. That was about 6 weeks ago and approx 3 weeks ago I spoke to a very helpful pharmacist who told me that because the symptoms had taken a while to develop after increasing my dose, they could take a few weeks to resolve once the dose was reduced. I then reduced my dose down to 100mcg and the symptoms improved (although didn't resolve completely). However, I was afraid of becoming hypothyroid again, after being on only 100mcg for 2 to 3 weeks, so I increased my dose again to 125mcg over the past 2 days, and today my symptoms are much worse. Is this coincidence, or might it be that I'm that sensitive to the increased dose after only 2 days? Has anyone got any experience of anything like this? Should I have a private blood test done and what tests should I have done? Would be very grateful for any advice anyone can offer. Thanks.