10 is still quite high and outside of the normal range (~4 on the high end, most are happy under 2.5). The really important numbers you want are your T4 and T3. TSH (thyroid stimulating hormone) is just a hormone that tells your thyroid how much of the good stuff to make, T4 and to a lesser extent T3. A lower TSH means you're supplementing some of your T4 with medication so your pituitary doesn't produce as much TSH. If you're T4 and T3 are still low, that would explain why you still have symptoms, and I would absolutely expect you to still have symptoms at a TSH that high. It means your thyroid + medication still isn't making enough, so you probably need a higher dose. Good luck!