I guess the question depends on what kind of licensed practitioner you're looking for.
I did a little research quickly on the topic, and there is the American Holistic Medical association, but to belong, one first has to be an MD or a DO, and licensed to practice medicine in their state. Other organizations may require far less, however.
The main point others have been trying to make, however, is that while some illnesses can be managed successfully (or in the case of short term illness, like a cold) with holistic therapies, others are a bit beyond the reach of holistic medicine. If its a major illness, a major malfunction of the body which cannot be righted without chemical intervention--sometimes you just have to take your pills in order to take care of the self, to restore wellness. If your brain is not producing enough of a chemical (to a large degree) or far too much, natural therapies are often not enough. To not acknowledge that some may have need of that which you've chosen to go without is rather closed-minded. Many here have acknowledged that holistic medicine has it's place. However, you don't give anyone else the same courtesy; instead, you give backhanded insult. You state modern medicine has its place, but then follow that up with a statement calling those who rely on it "weak". Does that then make a severe diabetic weak, because they rely on insulin? It's not a strong arguement, and it's uncomplimentary to your position. By mentioning the licensing, you also seem to set up an argument from authority--implying that by extension, you are also licensed--but that also fails, because if you're arguing against the opinions of MDs, you're not arguing from a peer position.
While I agree that often these days pills are handed out unnecessarily, and people put more reliance on the unnecessary pills than they should--there are some that need them, and cannot function without them. Those people are not weak, and to assume that eating right and exercising can fix *everyone* is sheer folly. Those folks simply have a brain that is malfunctioning beyond nature's capability to fix. This is why we have modern medicine, and why people rather thankfully live longer these days.