Thanks Kristine and Ms Arielle,

I've been considering the sun lamp idea to see if it would help with the discomfort.

Underactive thyroid does run in the family, but my issues have actually improved since I was tested so I doubt if NHS testing, which is very basic, would produce a different result.

What would a good high dose of Vitamin D be? I'll be stuck indoors until May, so I need a decent amount. Also, do I need to supplement with other nutrients to maximise absorption? I eat a good diet - rather low in calories - but containing oily fish, eggs, cheese, white and red meat, veggies, etc..