I remember due to not be able to relax and having to walk all the time. I would drink cream(from grassfed pasture raised cows) I drank a half liter of cream every day which is about 2000 calories and that gave me the energy and the calories i needed. Ofcourse i would eat other things during the day too. My advice would be to drink more of your calories, as it is quicker to consume and you can have it on the go. Just make sure its quality calories and not soda and ultra processed stuff. I wouldnt be worried about consuming more calories from saturated fat and getting cholesterol in my diet, its very healthy for the brain and cns. All the best to you mate.