Sounds more to me like you aren't converting that T4 to T3. The NHS won't test the FT3, so you really need to get private labs done to find out - FT4 and FT3 tested at the same time.
But that doesn't necessarily mean it will always move with T4. If you're becoming deficient in ferritin for example your body might be finding it harder to convert enough. I think all I'm saying is don't rule it out. Many folks who've been on levo for a while eventually find they need some T3 to feel well.
Ah ok! Well, a lot can happen in years. Your levels of nutrients could have gone down, affecting conversion, your cortisol could have raised. It's now we're talking about, not years ago. Conversion isn't something set in stone. You need to get the tests done again.
I developed a vile temper over the last 10 years or so and it just kept getting worse and worse. I accidentally hit on the solution when I gave up gluten.
Gluten doesn't just affect the gut it has effects on the brain too. I noticed a massive improvement about 5 days after I gave up the gluten. It was a tremendous relief.
If you have already given up gluten and it has made no difference, then it might be another food sensitivity or allergy.
If you have got results showing your TSH/Free T4/Free T3 can you type some of the recent tests in, please. We've all been told results are "normal" when they are anything but. It makes us very suspicious bunch.
Suggest you ask GP to check levels of vitamin d, b12, folate and ferratin. These all need to at good (not just average) levels for thyroid hormones to work in our cells.
Also do you know if you have Hashimoto's? have you had thyroid antibodies checked? There are two sorts TPO Ab and TG Ab. (Thyroid peroxidase and thyroglobulin) Both need checking, if either, or both are high this means autoimmune thyroid - called Hashimoto's - most common cause of being hypo. NHS rarely checks TPO and almost never checks TG.
Make sure you get the actual figures from tests (including ranges - figures in brackets). You are entitled to copies of your own results. Some surgeries make nominal charge for printing out. Alternatively you can now ask for online access to your own medical records. Though not all surgeries can do this yet, or may not have blood test results available yet online, but all should be doing this with couple of years.
When you get results suggest you make a new post on here and members can offer advise on any vitamin supplements needed
If you can not get GP to do these tests, then like many of us, you can get them done privately
If you have hashimoto's- at times the antibodies will flood out and attack your thyroid gland and at other times reduce. So you have swing's and roundabouts with hashi's.
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