Strewth Bluebell45 considering you've been supplementing for so long those results are dire and I'm not surprised you have so many symptoms.
Ferritin 18 (15 - 150) - 200mg ferrous fumerate. Are you taking one tablet a day? It's normally two, sometimes three.
Have you had an iron panel and full blood count done to see if you have iron deficiency anaemia?
Considering you have been supplementing for 6 years, ask your GP what he now intends to do about this. Suggest an iron infusion, maybe increase your FF if you are only taking one tablet a day. Take each tablet with 1000mg Vit C to aid absorption and help prevent constipation. Take iron four hours away from thyroid meds.
Folate 2.4 (2.5 - 18.5) - 5mg folic acid since 2016
Vitamin B12 181 (190 - 900)
Were you tested for Pernicious Anaemia?
These work together. You are still folate deficient and under range for B12. Do you have any signs of B12 deficiency - check here b12deficiency.info/signs-an...
I would pop over to the Pernicious Anaemia Society forum with these results for further advice. They are the experts and will give you guidance then you can follow up with a visit to your GP to discuss their advice.
25 OH vitamin D 26.6 (25 - 50 vitamin D deficiency supplementation is indicated) - 800iu D3 since 2014
Well, 800iu D3 won't raise your level, as you've probably gathered by now. It's not even a winter maintenance dose for someone with a reasonable level.
NICE treatment summary for Vit D deficiency:
"For the treatment of vitamin D deficiency, the recommended treatment is based on fixed loading doses of vitamin D (up to a total of about 300,000 international units [IU]) given either as weekly or daily split doses, followed by lifelong maintenance treatment of about 800 IU a day. Higher doses of up to 2000 IU a day, occasionally up to 4000 IU a day, may be used for certain groups of people, for example those with malabsorption disorders.
Several treatment regimens are available, including 50,000 IU once a week for 6 weeks (300,000 IU in total), 20,000 IU twice a week for 7 weeks (280,000 IU in total), or 4000 IU daily for 10 weeks (280,000 IU in total)."
Each Health Authority has their own guidelines but they will be very similar.
Go and see your GP and demand that he treats you according to the guidelines and prescribes a loading dose.
If you wish (and it might be a better idea) you can do it yourself with guidance from members. I got my Vit D level up from 15 to 200 in two a day a half months by buying my own softgels, taking a loading dose then a maintenance dose. I now maintain at around 150nmol/L. The recommended level is 100-150nmol/L.
D3 has important cofactors that are needed vitamindcouncil.org/about-v...
D3 aids absorption of calcium from food and K2-MK7 directs the calcium to bones and teeth where it is needed and away from arteries and soft tissues where it can be deposited and cause problems.
D3 and K2 are fat soluble so should be taken with the fattiest meal of the day, four hours away from thyroid meds.
Magnesium comes in different forms, check here to see which would suit you best and as it's calming it's best taken in the evening, four hours away from thyroid meds naturalnews.com/046401_magn...