This thread is close to my heart! apologies for long post.
Until GP's in the UK get to grips with Hypo/Hashimotos we are all it appears fobbed off. Let me explain if I can with my experience. I was diagnosed about 18 months ago, by accident with a really good locum GP who happened to be really thorough, before that I felt like I was dying except not every day, weird. I also had chronic low back pain which I now think was my adrenals.
Initially I was on 25mg now I'm on 75mg, but this is the thing, I still feel crap most days. I hobble out of bed, try to to a stressful job with brain fog and after sitting at night feel like someone twice my age with all the aching when I go to bed. I am constantly constipated (sorry tmi) and I have never weighed as much in my life and haven't lost anything after being on levo...
Now, after much research I like others take Vitamin D spray (great from amazon lasts 90 days costs £5) I also take magnesium (without it Vit D won't work properly) and also Selenium which helps T4 and T3 conversion. Yes I know the thyroid and it's hormones are really complex which I think is why GP's aren't interested asmif you are in 'the range' they are happy. I feel a little better but I know I'm still not completely better.
So after more research I come across the drug everyone took years ago (before the cheaper synthetic hormone-Levo was available) and this is widely used in America, called NDT or Natural Dessicated Thyroid. It's not licensed here but some people in the UK do buy it or if lucky have their GP write a private script for it. So next time I see my GP I shall be investigating though I am sure it will be a battle as NDT (Armour or Westthroid branded make) is more expensive and they will tell you as it's 'natural' it's unstable, but if you look further on the net many people feel better and here's the thing, actually lose weight and no longer have the aches and pains. Levo is only T4 NDT is both T3 and T4, I will stop now as I must be boring you all!