I found some stuff which may be useful to others too:
Fatigue and Dizziness
As you start dumping water, you'll lose minerals such as salt, potassium and magnesium as well. Having lower levels of these minerals will make you very, very tired, lightheaded or dizzy, give you muscle cramps, and headaches. This is one of the most common of the low carb diet side effects, and it can be avoided for the most part by making sure you get enough replacement minerals.
You can counteract the mineral losses by eating more salt or drinking salty broth, and eating potassium containing foods. (Dairy foods, green leafy vegetables and avocados are high in potassium).
As long as your carb intake is below 60 carbs a day, you will need to continue to eat a moderate amount of salt (5 gram/day which is about the same as the standard American diet provides). However, if you take medicine for high blood pressure, check with your doctor.
In addition, you may want to take 400 mg of magnesium citrate every night before bed. (Check with your doctor first if you have kidney or heart health issues).
It's also really important to eat at least 2 cups of raw green leafy vegetables every day. These vegetables provide potassium and vitamin K, and will also help with hunger.
Craving for sweets = Reactive Hypoglycemia
www.ketogenic-diet-resource.com/reactive-hypoglycemia.html
As you lower your carbohydrate intake, you begin a process of retraining your body to burn stored fat instead of carbohydrates for fuel. Normally, it takes from 1-3 weeks for the body to adjust the new lower level of carbohydrate intake, and build the enzymes needed to burn stored fat.
Meanwhile, during this adjustment phase, your pancreas is still secreting enough insulin for the older, higher level of carbohydrate consumption. And remember, because insulin levels are high, the body is dependent on carbohydrate for fuel, since stored fat can't be accessed.
Your body hums along with less carb intake for a couple of days because it can tap into the stored carb (glycogen) in your liver and muscles. But eventually, the glycogen runs out, more insulin is secreted than actually needed, and a couple of hours later, you have a severe episode of reactive hypoglycemia.
How to Avoid Reactive Hypoglycemia
In the short term, when first starting a low carb diet, eating more frequently may help.
Long term, the best way to avoid reactive hypoglycemia is to permanently reduce the amount of carbohydrate that you eat on a daily basis.
This will eventually lower your daily blood sugar and circulating insulin. Once insulin returns to normal levels, your body can then access its fat stores, and quickly switch over to burning fat for fuel when you go without a meal or two.
During the first phases of eating a lower carb, ketogenic diet, it’s a good idea to make sure you eat every 3-4 hours. Until you can retrain your body to burn fat, don’t try to go for more than 4 hours without food.
Paradoxically, some people who experience chronic hypoglycemic reactions report that waiting 5-6 hours before the next meal actually helps reduce the reactions.