You're doing something wrong if you haven't been to the doctor for anything at all in 15 years.
Not some kind of "OMG doctors are AMAZING!!!!onehundredeleventhousandonehundredandeleven" idiot either, I just know there comes a times when it's prudent to see a physician.
I see no reason to see a physician for basic problems. I tend to be more in tune with my body then most people, so if I feel illness coming on, then I tend to rest a lot to minimize it's effects. I rarely ever get sick though. The last time I was sick was about 2 years ago when I came down with the flu, but I used the flu to quit smoking cigarettes, so it actually ended up being a good thing. I eat healthy and use food as medicine.