Yes, this is exactly what I am going through! Lately, I have been praying every day that Yah would miraculously restore my son's pancreas. While the diet we had him on managed his blood sugars without relying on injections, I'm not convinced it's the long term solution. We've been adding in some grains, potatoes, etc here and there. His pancreas must still be working some, because he does return to normal on his own, but it takes longer and he still spikes too high.
So my struggle is not wether I have faith that He can perform a miracle, but wether He is going to. And if He does, how does He want us to take care of my son in the meantime.
This doesn't really have anything to do with justice, but I'm going to keep praying!