Hi, I'm new to this site tonight. I've been diagnosed with underactive thyroid for 2 years now but have no idea what my levels are as my GP doesn't tell me. I'm on a low dose of 25mg levothyroxin daily and that hasn't changed since I was diagnosed. As well as the tiredness, lack of concentration and other symptoms, I am now suffering from cracked heels and skin splitting on my fingers. Has anyone else suffered from this? Now vitamin B12 is slightly down and I've to have an injection for this.