Ketosis and diabetic ketoacidosis (DKA) are two different things. Ketosis is a normal and healthy process used by your body to maintain energy and blood glucose during fasting. Your liver can only store so much glycogen and once that's used up, your body needs another source of energy and it turns to fat. In order to breakdown the fat into something usable, your body breaks the lipids down into ketone bodies which can then be used for cellular metabolism.
Diabetic ketoacidosis is a condition in which your blood sugar SOARS (like 300-500 or more) due to insufficient insulin and ketosis continues in an unchecked/out of control manner. As your blood sugar increases, it changes the osmolarity (solute to solvent ratio) of the blood and excess sugar is dumped into the urine along with all of your sodium, potassium, and other electrolytes. Now that you're losing electrolytes, your body can't maintain hydration and things are often further exacerbated by vomitting. During this process, your body is continuing to dump ketones into the blood stream in amounts that exceed your body's ability to buffer and maintain pH. (Your pH drops into more acidic ranges, hence the name "acidosis.")
At this point, I wouldn't worry about ketosis. Follow the meal template and experiment a little with how fruit and starchy vegetables impact your energy, mood, and satiety. For me, fruit early in the day wrecks my satiety. It's less impactful in the evening. Sweet potatoes and other starch-heavy items are awesome though and adequate fat is absolutely crucial to keeping me satisfied.
Tinker around with how much fat and protein you're eating at each meal and if you find yourself ready to just chew your arm off, then eat. It's not unusual at all for folks new to the Whole30 reporting that they need four or even five full template meals to keep them going in the early days. Your body will figure it out and your hunger will level back out.