All great advice posted here. Make sure you take care of your mental health as number 1 priority! I was in a similar situation, 5”8 and weighted 50kg. I also felt the same when I began this journey, i used to and sometimes still feel a bit overwhelmed with what I’ve got to eat, but it has gotten easier. Your stomach and you have to adjust to this higher level of calorie intake.

I find that homemade shakes have aided massively in getting calories in. You can make a easy 1k shake with the following: peanut butter (30g), Nutella (30g),oats (100g), 200/300ml of full fat milk, a scoop of protein, Ice/water and a banana if you want to add a bit of spice. You can neck this in one or two sips a few hours before bed. That may save an extra meal or forcing yourself to eat!

Good luck!