Quoting Lu⁺Freya:" I've never made enough for her (hypothyroid) and she's been combi fed since birth. She's just getting ... [snip!] ... She's just getting less and less now and more frustrated with me so, just makes me think it'll end sooner rather than later."
I understand. Well, if you want to try to boost your supply while you combi fed, nurse her from one breast and pump the other. This will tell your body to start picking up the process. Because you worry about what you are producing, you are going to trick your body. Hopefully they can figure your thyroid situation out.