Sight is not faith, and hearing is not faith, neither is feeling faith; but believing when we neither see, hear, nor feel is faith; and everywhere the Bible tells us our salvation is to be by faith. Therefore we must believe before we feel, and often against our feelings, if we would honor faith.
You must hand yourself and all your inward experiences, your temptations, your temperament, your frames and feelings, all over into the care of your God, and leave them there. He made you and therefore He understands you, and knows how to manage you, and you must trust Him to do it.
A feeling of real need is always a good enough reason to pray.