JSo, I can understand your frustration at GP's refusal to help/treat you. Whenever my TSH is over 2-2.5 I start feeling sluggish and brain-fogged.
Strangely enough, there is a difference in what the gp-s and the specialists take as upper and lower TSH limits: GPs use 4 as upper limit, whilst endocrinologists think really it should be below 2. In other words, with your TSH value, if you would be referred to the specialists they would put you on thyroxine right away. Could you try to get referral? How did you find out about the antibodies, could you use that as an excuse to be referred???
I was told at my last blood test that usually labs only test TSH initially, and only if this value is outside limits they test free T4 and/or T3.
About the antibodies: I also have thyroid (peroxidase) antibodies. I was told that my having these may have been a result of a disease called postpartum thyroiditis. Apparently this is quite common (if I recall as many as 1 in 10 women), where after giving birth your body starts attacking the thyroid gland. Not in all women this results in permanent damage to the thyroid gland, but from having discussions with other "victims" on mumsnet it has become clear to me that in many it does, and symptoms can be mild or mad. Probably also depending on how clever your mw/gp/hv is in picking up on your symptoms, and telling them apart from postnatal depression.
Anyway, dh just told me dinner is done and on the table, so I'd better go and eat! Yum!