You haven't given enough relevant information for anyone to really make an informed decision.
You didn't provide current age, height, or weight...and you said light activity level. You also didn't state how many calories you're eating and without the previous mentioned info, it wouldn't be possible to give an informed decision.
http://www.bmi-calculator.net/bmr-calculator/ and http://www.bmi-calculator.net/bmr-ca...dict-equation/ will give you an approximation of what you should be eating.
If I had to answer your question on a whim..I'd say NO, that is not sustainable. Simply because you said you don't like it in the first sentence (or maybe you like the taste of vomit?), but also because it doesn't look like enough calories to me. The point of weight loss is not starvation. You're hardly eating any protein at all.Your body will start eating whatever lean mass you have and you'll end up skinny fat.