Do not let them depart from your eyes; keep them in the midst of your heart:
For they are life to those who find them, and health to all their flesh."
Proverbs 4:20-22 (NKJV)
Knowing what medicine to take, when, and how, can be very helpful. It would be sad to have some medicine available to you that could help you physically, but you never take it and so you never receive the benefits of it. You could visit a doctor and they could give you a prescription, or you might even know about some kind of medicine available to you without a doctor's prescription, but if you never make use of what is available to you then you will never experience the benefits of it.
While I am certainly not against doctors or medicine, what many people don't realize is that God has given us medicine to help us with physical problems and as a preventative. In Proverbs 4:22 it tells us that God's Word is "health" to our flesh. That word "health" can actually be translated as "medicine", God's Word is medicine for us. If we will spend time reading and studying God's Word, listening to God's Word, and thinking and talking about God's Word, it will help us physically.
Again, I have nothing against good doctors or medicine, but when God has already given us something that will give us life and health, something that is already available to everyone, why not follow God's prescription and take His medicine? You don't have to throw away what your doctor may have given you, but make sure you are diligent about taking God's medicine. As we fill ourselves with God's Word it will help us physically, God's Word is medicine for us.