GO.
Give him another shot at it.
And one day go get a physical when you're healthy. Quacks do their best work on healthy people.
Seeing a doctor when you're healthy is the best way to avoid seeing them when you're sick!
I had my physical last month and other than some vitamin D deficiency, my numbers were really good overall. A very big improvement over the year before.
Still working on the weight loss thing. I dropped a few pounds.