Aimeek, the thyroid doesn't produce TSH, the pituitary does. It produces TSH (Thyroid Stimulating Hormone) to tell the thyroid to make more thyroid hormone.
The thyroid makes T4 and T3. T4 is the storage hormone that is converted into T3. These are the ones that should be tested to find out your thyroid status. Low T3 means that you are hypo. High T3 means you are hyper. If you are hypo, you need to take thyroid hormone replacement (Levothyroxin T4, usually).
Usually, when the TSH is high, the FT4 and FT3 are low, and vice versa. But this is not always the case. Which is why they should all be tested and not just the TSH.
The anti-bodies are produced by your immune system because it mistakes your thyroid hormones for the enemy (it's a bit more complicated than that, but we'll keep it simple for now). They slowly destroy the gland. But from time to time, a bit of gland breaks away, full of hormone, and dumps that hormone into the blood. That makes the TSH level vary, and is therefore not a very good indicator of thyroid status.
You are right. If left untreated, damage will be done to your gland. And it has been proved that starting Levo (T4) can reduce the antibody attacks and make the patient feel better. But doctors don't know that. But, as Clutter said, your antibodies are only low at the moment, and might be controlled by going gluten-free. It's Worth trying.
Auto-immune hypothyroidism shouldn't just be treated by blood tests (and certainly not by the TSH!) Symptoms should also be taken into consideration. You are showing a lot of hypo symptoms, it's true. But some of them could be due to nutritional deficiencies - the ridged nails and heavy periods could be due to low ferritin, the dry skin and depression due to low B12 - not saying they are, but could be. Hypos are often low in vitamins and minerals. So, what you should do now, is get ferritin, iron, folate, vit D and vit B12 tested - all should be at least mid-range, B12 even higher - and supplement where needed. You might be surprised at the difference that makes to your well-being.
As I said, doctors don't know they should be treating when antibodies are present even if thyroid hormones are 'in range', and are reluctant to treat until TSH reaches 10, sometimes. But next time you have a thyroid test, insist that he does the FT4 and FT3 as well. Although the lab might not be willing to do them, you can but ask! These may be low even though the TSH is low.