My grace is sufficient for you, for my power is made perfect in weakness. God says this to Paul when he prays three times for a suffering to end. The answer is not healing but: My grace is enough.
This is not cheap comfort. It is a deep truth: God's power does not need your strength as a foundation. It shows itself precisely where you are at your end. Weakness in the New Covenant is not a disqualifier, it is the place where grace becomes visible.
Peace does not come when everything is perfect. Peace comes when you know: Grace is enough. No matter how weak you feel.