TLDR version - Hashimotos Protocol diet - cut gluten / dairy - better supplementation - Sauerkraut and H&B Highstrength Acidophillus probiotics.
Long Winded version below -
I basically have thrown the kitchen sink at it once I realised that my doctor / NHS would only mono treat me with Levo with the goal of managing TSH. TSH was in their 'ok' range yet I still felt awful (brain fog / tiredness like narcolepsy / massive weight gain). Read numerous websites (Chris Kresser / Mercola and of course the great info from people on here etc) bought books (Wentz Hashimotos protocol / Amy Myers), thought I would try dietary changes and ran it by my GP - who said I was wasting my time and that he could not advise me based upon 'Internet Quackery'. I took my wife as a witness tbh and she was appalled when he said It really doesn't matter what you do as far as I'm concerned -- you'll come back here and I'll either raise / lower or stop your levo based upon TSH bloods. He didn't want to acknowledge my Blue Horizon tests and the positive antibodies and refused to add them to my medical record.
So I started cutting Gluten / Wheat and within a few weeks saw great improvements and I've worked from there, I've reduced my carbs (or certainly more control over them) and limit sugar. I then moved on to eliminating dairy and this has yielded great results, and with this I seem to have stumbled across the trigger for my low moods that have plagued me for years. I've tried to re-introduce dairy due to being a Pizza-holic and general Cheese connoisseur but my mood drops through the floor very quickly so no dairy for me (for now) -- will try again in 6 months which seems to be the time it takes for the immune system to re-right itself. Added various vitamins / supplements to my regimen (lots of good advice on here) B12 sublingual / D3 / Zinc / Selenium / Folate / Probiotics (both fermented food e.g. SauerKraut - not that keen but what the hey, and Acidophillus capsules the max strength H&B ones), also recently some pre-biotics (inulin) added to my daily Wentz Green Smoothie. I can tell this is inflammation / auto-immune based due to the condition of my skin - when i get cross contaminated with Gluten or Dairy my skin puffs up, I also get a break out of spots. This whole thing has been a scary ride - going from feeling ok to being on the seat of my pants in a number of months but the positive is it has made me re-appraise what I eat from top to bottom. You wouldn't put diesel in a petrol car so why do we so blindly fill ourselves with for want of a better word 'crap' food. Problem is all the dietary advice has been wrong for so many years so what hope do busy normal people have...
Also I still have not adjusted to being the 'allergen weirdo' when I go out with family / friends for meals - the looks of derision. But hey at least I'm a happier and healthier weirdo!