Well, yeah. It is. It's very unbalanced and just plain unhealthy, ya' know?
Yes, it is! Your body needs over 1,000 calories a day to function properly. At least try to get something in! If this is for losing weight, then I suggest eating 1,200, that's the lowest you should go if you're overweight/obese. If this is an eating disorder, please see a doctor so you can make a healthy weight plan and get back to eating normally.
Some weeks, I eat every 3 days. So from experience, yes. I started out like you, eating every other day until it got worse... Please, please, please get help before it gets too bad. :/