I totally agree with the liquid calories, as it is way easier to drink down a protein shake, than say chew up a couple of chicken breasts.
Now, I am not much for juicing, but, I good whey protein powder will go a long way in helping you get your calories in.
With this, you could have a small handful of mixed nuts.
However, since in seems like you really have no appetite, I would replace nuts with a piece of fruit like a banana, I say this, becasue, the lack of fat in a "meal" like this will have you feeling hungry faster than if you had something loaded with fat.
One thing to remember, a meal does not have to be a massive affair, it could be as simple as a couple hard-boiled eggs and some toast or the above protein shake and fruit or nuts.
If you are really having a hard time eating, try taking in a protein shake with some peanut butter mixed in--you could also mix this with milk or almond milk--before bed.
One other thing you could try is to do some easy aerobics, nothing super strenuous--just do whatever you enjoy for a half hour 3 times a week, this will, over-time, help with your appetite.
Hope this helps.