Omad for 3 month? What the main and side effect

For the backround im 22 woman 162cm 65kg, experience in extreme fasting for several days such as dry fasting 5 days, water fasting 7 days, iu's diet, etc but somehow still in the same weight bcs i cant control my food after that.

Since im in the last semester of college rn, i want to look good on my graduation pic, so i need to lose weight for like 10-15 kg and saving the money for the dress, hire a makeup artist and any graduation prepare. So i would just eat in the night at my parent home and limited it to 1700kkal

I wondering what the side effect after that and should i workout while omad so i can lose around that number?