Yes, in cases where the conflict is resolved, the remission is evidence of it. For cases where no remission occurs, the conflict was not resolved. I know this to be true from my own experiences. This is part of the power of forgiving others, you actually save yourself from becoming ill from the conflict. For their own sake if nothing else, for example, spouses should forgive their ex-spouse and continue to love them, if the conflict is retained in the emotions the retaining person is going to fall ill.
It is a mistake of western medicine to divorce the mind from the body, but this is the way of medicinal profiteering. In the east, on the other hand, metaphysics was retained in the equation.