When I found this site I had been Hypo for around 15 months and had felt fairly well for most of that time but had started to go down hill - feeling really tired and having to sleep loads plus aching joints and the wretched Plantar Fascitis in one foot. Having read on here about the importance of vitamins I had a full blood test and lo and behold found I was very low on Vit D and low in Folate and Ferritin. I immediately started on supplements and soon felt heaps better - the only remaining problem was the aching feet, apart from that I felt reasonably OK. I have read a lot about how my dose (50mcg) of Levo is normally a starter dose, and bearing in mind my blood results T4 10.98 (9 - 20) and TSH 1.66 (0.55 - 4.78) I thought that maybe a small increase would be all that was needed to make me feel 100% so yesterday I increased my Levo to 75mcg (taken at 3am in the morning instead of 6am 'cos I just happened to wake-up). Yesterday was rubbish - I felt odd and thought my heart was racing (it was actually 80 beats per minute resting so not a problem) and I was incredibly irritable. I also had far more hot flushes than normal and last night slept for longer than is normal for me and have woken up with Plantar Facsitic in both feet! DUH - back to 50 mcg me thinks because feeling just reasonably OK is far better than how I feel today. Have other people experienced problems when raising their dose, even such a small amount?