you are very right about normal range of tsh levels. At 8.5 milli units/ml, with normal t4, the condition is classified as sub- clinical hypothyroidism. This normally is not treated with any drugs. Treatment is advised only once the levels cross 10 milli units or there are troublesome symptoms with lower tsh levels. As regards food intake you have to have a balanced diet, but avoid certain foods like - soy beans, soy containing products, cabbage, cauliflower, broccoli, peanuts, radish, mustard and coffee. Consume good deal of green leafy vegetables, salads and fruits. Use whole grain flour for making chapati or roti. Do not use refined flour like maida. If you are taking non- vegetarian diet then take lean meat, skinned chicken and fish. Exercise regularly, that is important. Further, if one is desirous of having conception, then before conception tsh levels have to be brought down to around 2 mill units/ml. Keep that in mind. Thanks for the question.
It's cause of concern that your insulin is not acting to neutralize the sugar while you are taking good medicines prescribed by your experience doctor. This is non response of drugs. It's not fault in treatment by your doctor. I would suggest the support of ayurveda medicine as support to your current medicine. Both won't counteract with each other. Observing the response of this integrative approach, further directions would be decided.
If you agree, I would mention the first phase of safe, side effect less, easy to take and economic medicines which will prevent complications also.
As per standard protocols, there needs to at least 5 years of seizure free period before tapering and stopping medications. Newer protocols followed by some doctors believe in stopping medications even if there is 1 year of seizure free interval. It is best that you consult with your neurologist and let him decide on what is best for you.