I believe that God provides many things to help us. If He chooses, He can remove a disorder, but I think that more often there is something that we or someone else needs to learn from the experience. He may help us by providing or inspiring someone to develop or leading us to a medication, a treatment, a support group, etc., or by putting a friend or other helper in position to do or say something at the time when it is most needed. There's more than just one way to be healed.