I've been doing low fat some cottage cheese lately, I add a little splenda in it to sweeten it a little.
Some of my other favorite filling healthy snacks:
Grape tomatoes, Sweet Bell peppers, string cheese, Celery and peanut butter (or almond butter), Broccoli florets
Also, if you have a hard time eating veggies, a good thing to do is find something that makes the veggies a bit more palatable to you. Laughing cow low fat soft swiss is quite yummy as well as hummus or tzatziki. I made my own tzatziki the other day, here is a link for 2 slightly different versions.
Tzatziki Sauce (Cucumber Yogurt sauce)