Thanks for your replies, I got my cushion from Amazon and it's shaped like a semi circle so you can lie down with it under your knees or between your knees if you sleep on your side.
I've got blood tests tomorrow and my thyroid levels were high last year but GPs don't change the dosage of Levothyroxine unless it's it's over 5.
My aches have come back now, ah well ☺️

yes.....I am addicted to my electric blanket. It seems to 'iron or melt out' my aches and pains

Yes, I run cold but perhaps you need thyroid medicine... get checked

Yes I get that but I can't tolerate heat and humidity either.
My temp always runs low like 97.6