I see such an enormous amount of knowledgeable advice given from you lovely people that I wonder if you can help me?
I'm a 45 yr old female with typical boringly long history of nagging health complaints- anxiety (well controlled on fluoxetine), extreme tiredness and lethargy, frequent headaches,skin complaints including very dry skin and funny bumpy rashes on elbows and knees that come and go,and a twenty year history of irritable bowel type symptoms.
I've had blood tests in the past which just showed slight anaemia.
I went back to the GP recently asked to be tested for coeliac-and she also ran a full panel-liver and kidney function came back dead normal but others are as follows;
TSH: 2.8 mu/L. 0.27 - 4.20mu/L
Calcium: 2.18 mmol/L. 2.15 - 2.55mmol/L
Vit D: 31 - abnormal-gp recommends supplements
Haemoglobin estimation: 109g/l. 120-150 g/l
Ferritin: 5 ug/l. 13 - 150ug/l
B12: 228 pg/mL. 180-914pg/l
Serum folate: 4.4 ng/ml. 3.10-20.00ng/ml
ESR: 31 mm/h. 0-12mm/h
Coeliac screen- normal
Obviously from this I'm anaemic and ferritin is very low, and because my ESR is also high my gp referred me to gastroenterologist for bowel investigations.Gastro was pretty dismissive and thinks I just have IBS, he basically shrugged when I mentioned my ferritin level is 5. He is going to do a colonoscopy just to be sure though. In his clinic letter he said the anaemia doesn't warrant further investigation as I still have periods. Even though they are normal and not heavy. 
The gp will discuss iron supplements etc once I have had the colonoscopy. I did ask for more detailed thyroid tests: free t3 and 4 and thyroid antibodies but she refused, saying my thyroid result was dead normal and my symptoms were probably just caused by anaemia, which goes against a lot of the advice I have seen, but I don't feel I can argue with my doctor, even though a lot of my values are at the bottom end, like B12, but she won't do further testing as they are 'normal'.
Any thoughts? I really don't want to feel this grotty for the next twenty years!