From personal and research experiences with ketogenic diets, mood swings are more a function of insufficient energy intake coupled with an inability to use the calories that you are taking in.
Translation: your body has not learned how to use fat as a fuel, so it is basically starving and is as such, sending your mood into the toilet.
To fix this, increase your caloric intake from the foods that you can eat (zero-carb high-fat foods like cream, hard cheeses, fish with oils i.e. sardines, salmon, etc) until your body learns that fat is an energy source. Some people call this the adaptation phase as Adam wrote about.
Also, Adam is right, you have to be mindful of your fat intake. If anything, cut back a little more on protein and add more fat foods. Another thing that might help is MCT oil: it's preferentially oxidized and not stored, so it will help your body learn how to use fat and spare glucose (the more glucose is spared, the less your blood sugars will swing, and the better you will feel).
Don't give up on the diet. Give it at least one solid month before you stop. It takes some people more time that others to make it work for them, but in the end it is worth it.
Also, I may seem biased, but I do know exactely how you feel. I have a VERY hard time adapting to a ketogenic diet. It takes me a lot longer than other people to get my body to use fat as a fuel; but, in the end, I feel much better, think much better, and can concentrate much better than when I'm on any other low-calorie diet.
OH! one more thing: TRY DROPPING THE SPIKE. It's a powerful stimulant that may be another one of your mood-altering problems.
Hope this helps.
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