Adapting your body into a ketosis state can cause some initial problems. Most commonly, Keto flu (caused by carb withdrawal and your body adjusting to ketosis), digestive anomalies and dehydration. All have solution and are part of your body getting used to a low carb state. Make sure you drink plenty of water and get all the electrolytes that you need. You can find more on this topic in the r/keto FAQ section.