Yes you have hashimoto’s disease an autoimmune condition where the body produces antibodies that destroy the thyroid. It is the major cause of hypothyroidism in Europe. There is a lot of info on this site you need to research more.
Your blood results also show you are severely undermedicated, I suspect your gp knows little about hypothyroidism or how to treat it. Sadly many endocrinologists are also not very well educated about the thyroid as they are diabetes specialists.
With most chronic diseases, people have to research and find the best way forward for themselves. If you are lucky your gp is an ally, but for many they are unhelpful due to a lack of knowledge.
Your first step is to ask for copies of all your blood results, plus what dose of levothyroxine you were on at that time. If you can start a health diary to record some of your symptoms and how you feel. If there has been a time you have feel well it gives you some idea of optimum blood levels for you. Remember a range encompasses 95% of the population, and for TSH it is not a symmetrical curve, the majority have a TSH of 2 or less.
It is a slow process but worthwhile to regain health.
Your results from when on 150mcg did not show over medication. They showed poor conversion, very common with Hashimoto's
Likely to have low vitamin levels too
You need dose increased back up in 25mcg steps. Retesting 6-8 weeks after each dose increase
Vitamins must be optimal
Strictly gluten free diet likely essential
Hashimoto's affects the gut and leads to low stomach acid and then low vitamin levels
Low vitamin levels affect Thyroid hormone working
Poor gut function can lead leaky gut (literally holes in gut wall) this can cause food intolerances. Most common by far is gluten. Dairy is second most common.
According to Izabella Wentz the Thyroid Pharmacist approx 5% with Hashimoto's are coeliac, but over 80% find gluten free diet helps significantly. Either due to direct gluten intolerance (no test available) or due to leaky gut and gluten causing molecular mimicry (see Amy Myers link)
Changing to a strictly gluten free diet may help reduce symptoms, help gut heal and slowly lower TPO antibodies
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