Oops, forgot to add: I stand up all day for my job and move around a little bit, though on slower days like today it's mostly just standing at the desk.

 

Maybe not in danger of fainting, but dizziness, low-blood-sugar nausea, and irritability are very likely.

 

Fainting no, but your blood sugar could drop and you could get dizzy.
My blood sugar is just a nightmare to regulate and I do faint because of it, but there's no reason for you to be fainting unless you start like, heavy cardio for multiple hours a day with water fasting. Even then it's questionable.

 

Could I eat fresh fruit if I'm feeling like my sugar is low?

 

My advice is: don't fast for 3 days the first time. If you're not used to eat less than 1200 kcal (btw, keep avoiding restricting lower. I'm your same height and 1200 kcal is far from what you'd need to mantain) you're going to feel very bad. Especially if you have to stand up a lot. Try one single day first. See how it goes, if you're too dizzy, if you binge after that... if both answers are no, then you can try a longer fast.
Also, if you're feeling like you're going to pass out or something, eat! A piece of fruit is fine. Better having like 100 kcal rather than feeling sick, fainting etc

 

You should be fine on a 3 day Water Fast
You might be a little light headed if you rush while getting up from a sitting position say
But other than that , go for it

Iv done a 23 day Water Fast before
Currently on day 9 now.

Good luck

 

I'm on day 25, and I do chores and go to class. You should be fine.