Thanks everyone for your responses.
Decided to grit my teeth and stick with the new regime for 2 months so thought I would give you an update.
So, hot flushes, depression and gastric problems seem to have settled down mostly, but joint pains (hands and spine) are really bad and sleep quality is very poor. Can get off to sleep, but wake around 5am most days. It's like someone has turned the lights on and I'm wide awake, but don't know why. Also, not feeling quite so responsive in the bedroom dept. which is important to us.
Overall, I feel that I was much better with a Mirena and oestrogen patches so in spite of the anticipated difficulty of the fitting, think I'm going to go for another coil in the New Year.
As an aside, when I went for a hysteroscopy about 4 years ago, they told me that they couldn't find one of my ovaries on the ultrasound and that it has probably shrivelled which can happen. Could this be why I've had such a horrible time ??
Happy Christmas everyone!