Jesus' healing of the woman who had a flow of blood for twelve years is unique among His miraculous healings in that He healed her without speaking a word.
The Bible is replete with individuals applying physical remedies (balms, poultices, as well as a competent physician's counsel) in tandem with trusting God.
Sin causes disease, but the person who becomes sick does not necessarily commit the sin. Because God alone can forgive sin, God alone can heal.
We must establish an iron clad trust in God for spiritual matters, including healing, rather than having a misguided trust in self or other human beings.