I haven't ever tried their fitteds. I am a Fuzzi Bunz girl (well pockets in general but FB's are what have prove themselves time and time again over the last 7 years of trying differet ones), but I also love flats (or just flannel...
You might also want to look into a glandular adrenal rebuilder as well. It is important to support and rebuild the adrenals while treating the thyroid.
Oh and I find selenium to be really beneficial to me, too. So you may notice good...
FWIW, my T4 was 1.02 at my 4week pg draw, then .77 at 10weeks (last draw was at 29 weeks but I don't recall that number). This was my first pg in a long time that resulted in a healthy, living term baby! I was also on Armour Thyroid...
I don't know of any actual bank that doesn't (but I don't know much about them, either)...I mean, it's still more beneficial than the alternative, I'm sure, since it's still human milk, and like I said, I totally get why they do it...
Don't let yourself feel guilty! Mommy guilt will eat you up if you let it....you are doing an awesome job and have already given your little ones SO much more by breastfeeding as much as you can than many babies (singletons!!) ever get!!!!
Do you have someone local who could donate to you? Might be worth looking if you are comfortable with that. I have only donated locally (for free, but if I was doing it long term I would just ask to have the cost of te bags covered) but...
Oh yes...I HATE when mothers are made to feel guilty about car crying, so no hate from me! My DD1 screamed her head off in the car for the first 14 months of her life (and we live 20 minutes from town...LITTLE town...bigger...