sorry to hear about this, hope you can recover soon.
I have no idea about this topic, but suggest you consult more doctors first before stopping bf.
meantime, there are still a lot of moms breastfeeding their elder one when pregnant, so don't worry too much. take more rest first.
我把平安留給你們,我將我的平安賜給你們;我所賜給你們的,不像世界所賜的一樣。你心裏不要煩亂,也不要膽怯。(若 14:27) Happy moments, praise God. Difficult moments, seek God. Quiet moments, worship God. Painful moments, trust God. Every moment, thank God!!!