Thanks for all your replies. I did actually find that getting it all out made me feel much better - you can read it afresh and forget who wrote it - i would tell any woman who wrote that what you all told me. I know, i tried, it worked for a while, then it didn't, so i tried something else.
DD is fully weaned anyway now, and has cows milk, not formula. My initial plans (before the birth) were to BF for the first year only, so although i have no doubt that i'd still be BFing now if it weren't for this, i think relactating and the challenges it would bring would probably be detrimental to my emotional recovery from this. I am certainly going to BF my next and subsequent babies and this shouldn't happen again.
loraxc - thanks - you didnt upset me more, it's good to have ALL the info and also know someone else who's lived with the same thing. My thyroid was very hyper for the 4mos Post partum, and my body then developed full-blown Hashimotos in response (detecting it as foreign as it was so overactive) and went very hypo. The doctors wanted to do radioactive uptake testing on my goiter when DD was small and i was losing weight and my supply, but luckily my goiter went of its own accord with the Hashimoto's, so i avoided that in the end. They didn't want to put me onto meds before finding out if my goiter was dangerous and it didn't shrink almost completely until DD was already weaned. I basically managed to avoid the testing (which i couldn't have fed through/after anyway) and the hyper meds (which are the nastier ones and again, preclude BFing in many cases) by waiting and getting ill, but it didn't save my milk ultimately.
My mum had longer than usual thyroid issues after her babies and i was hoping to avoid the life-long meds by waiting it out, but it wasn't to be, and i am now on levothyroxine. I know about having levels watched during PG but thanks again for sharing that knowledge - that could potentially saved SO much heartache if i hadn't known.
Bri276 you're right, i know FFing isn't neglect - it's just sometimes people push reports about how detrimental Formula is in your face and you think "well, i know this, but what's my alternative? Starving my baby?" I am NOT anti-FFing, i am just very very pro-BFing and i guess something we're really attached to the idea of, and really work towards and try our hardest at can be the most difficult thing to let go of, even when letting go is the healthiest thing.
About 40 minutes ago i wrapped DD in her snuggle blanket, gave her her bedtime lamb (to suck his tail, because apparently that's the best bit

) and rocked her to sleep and then just held her for 20 minutes. I put her down after that as she sleeps better in her own room, where it's peaceful, but i realised how much closeness we do still have.
Through all of this i think i've learned that BFing doesn't make a mother, flexibility does.
Thanks again everyone.
Bxxx