In my experience, with chronic fatigue, mercury fillings, and allergies, I found one thing to be true. The more I tried to do things on my own, the more time and money I wasted. But whenever I said a good prayer and asked for help from God with Genuine faith, I ended up finding or stumbling upon a healer to help me.
So I think God does heal... Even if he doesn't choose to heal us directly, he will lead us to somebody that can help...