Over time many health questions will be answered. Please don't take any of this as professional advice. However, the Spirit of Prophecy is a good guide for some of us.
No. The quotes listed will clearly show that surgeries can be okay.
No! Man's original diet was plant-based and resulted in people living for hundreds of years. After the flood God allowed eating of meat, but resulted in a much shorter lifespan. In the last days messages have been given that strongly encourage a plant-based diet. This diet has been strongly supported many years the findings of science.