Not consuming enough?

Hey all, I am getting close to 4 months post op and I am only taking in 400-600 calories a day. I don't feel hungry, even when I do, since I don't crave anything I don't want to eat. I know I've not been taking in enough protein and when I remember to try and 'catch up' its later in the day. I can't eat at my desk at work and my work never gave me any accommodations to help with meeting liquid and food intake which makes it a lot harder. I feel like I've gone off the rails but also having a bad mental night so focusing heavy on the negative which I was doing well at combating the last couple weeks.