You need to eat more.
Eat some fruit, PB and drink some whole milk with your protein bar.
Bump it to 4-5 whole eggs in the morning with 3-4 egg whites, and split it into 2 sandwiches so you get more carbs
Not sure how big the pieces of chicken are either.
But just going off what you said you ate that day, make these very very simple changes. Your diet still won't be awesome, but eating more would help.