I think you need a hard-boiled egg or some low-fat cottage cheese. Your body is craving something that it's not getting, and I suspect that something is protein.
Even when you are losing weight, you want to maintain some muscle.
I've found that drinking a glass of skim milk helps a lot.
What I must do is quit dunking Oreo's in it.
Have you looked into the sugar free Jello? It's very good, and there are all kinds of no-sugar-added canned fruits you can use in it. Drain the fruit, and use the juice as part of the cold liquid called for in the Jello. Jellow also has protein in it.
My mom used to eat cottage cheese and fruit for supper a lot. (My dad worked second shifts, and we had our big meal at noon.) That, like the Jello, is something you could take in a little plastic bowl.