You are not alone in doing this, many many people comfort with food!
Sometimes it can help to keep the hands busy with handheld games, spinners, knitting, needlework, (i learned American Sign Language and practiced,) and keep the mouth busy with a few strong flavoured candies (could be sugar free or not,) ice chips, sips of water, flavored water, tea.
With regards to your benefits being cut, many farmers markets, and some grocery stores will give you double your money on fresh produce when you pay with benefits. Feel free to ask! You can slice many veggies like carrots and beets thin, bake them crisp, and make a healthier "chip." Get creative with lots of sweet fruits and and savory veggies. Ask vendors for ideas. Ita stretches your dollar, is healthier, and makes them a sale.
All the best to you!