If you are feeling that amount of hunger i would say eat.... 1900 really isnt that much and even if you are gaining weight i think your body might still want more energy, and you might be going through an extreme hunger phase.
I know it might feel "wrong" to eat more when you are already gaining weight, but if you are so hungry then you need to eat more. I dont really know how much weight you need to gain, but even if you are close to your goal weight, dont worry about overshooting it. Instead, give your body lots of energy and rest for a while and try to let your body balance itself out. The best thing you can do is to give it a try and eat more. During extreme hunger people can eat anywhere from 3000-7000kcal in a day, and i know it sounds alot or sounds like a binge but it isnt.... its because your body just wants lots and lots of food and wants energy. But also if you have been very "strict" with your weight gain and eating, then i think this is your body saying that...."i need more food, 1900 isnt enough".
Its recommended that for weight gain you try to eat around 2500+kcal a day, because think if you are eating 1900 kcal a day and gaining weight, that means your metabolism isnt where it should be as most people eat around 1900 and maintain.
I think the best thing you can do - even if it seems scary. Allow yourself to eat.... whether its 2 days of lots of eating to give your body some type of peace or if its a week, it doesnt matter. Dont step on the scale... because really, you wont gain that much extra weight, it will be alot of water weight most likely but if your body is screaming for food, there is a reason for it.
Think like this.... everyday your body needs around 1200-1500kcal a day - just to function and to be alive... for all the processes in the body to work properly, and from those calories the brain needs around 800kcal a day (and needs glucose to function!). And then if you are studying that means the brain needs even more glucose each day, and during recovery your body is trying to repair itself from all the damage... the metabolism is trying to get back to normal and normal body temperature and all of that takes alot of energy, and then of course just moving and doing daily things such as walking to the fridge, putting on clothes, making food, going to the bathroom, taking a shower etc all of those things take energy, even just lying in bed or sitting and reading means your body is burning calories.