Thanks again for the brilliant advice given to me yesterday.
I went back and saw a different GP who agreed to me having a blood test tomorrow so that I can increase the Levothyroxine from 50mcg rather than wait for the three months the first GP suggested!
As advised, I asked about testing for Vit D, ferritin, Vitamin B12 and folates. It turns out that I had two of these tests 6 weeks ago with results as follows:
Serum ferritin - 21.4
Serum vitamin D - 46 (< 50=deficiency)
TSH - 135.96
T4 - 3.6
Thank goodness I asked as the first GP didn't even mention these results were out of range. I have now been given ferritin and vitamin D and will be tested for the B12 and folates as part of my blood test tomorrow.
To be honest - I am thinking of increasing my Levothyroxine myself after I have my blood test tomorrow as I am sure that is what the doctor will do anyway and it will mean I feel better quicker as it gains me a few days! Has anyone else done that?
Also, are there any other vitamins anyone recommends me taking?