I do understand about wanting to nurse your baby, but you need to get this high BP under control. You also need help with your pain and that can only be done if you stop nursing.
I couldn't nurse at all, I have three children and never had enough milk to feed my children. I did try everything possible, nursing classes, special diet, anything, but I did not have enough milk. I have even rented a pump, but the most I would get out of both breasts was barely enough to cover the bottom of the bottle, I talking just drops of milk.
So all three of my children are bottle fed and did just fine.
I was just recently put on MTX and my rheumy had me stop the plaquenil and all other meds. I can take pain meds if I absolutely have to, but because of my liver problems I try and go just with MTX.
Take care of your body, so that you can take care of your sweet little baby. ( Just a motherly advice, the same a would give my daughters.)
I may have been dealt a bad hand, but at least I'm still playing with a full deck. ( most of the time anyway).