We are just back today and I was also really stressed about not having enough. When we go to WDW we always have the Dining Plan, so hadnt paid for food for a few years.
We (as a family of 3) had $220 a day to spend, and we managed fine, never in a million years did I think that would be enough, but it was.
With this I splurged about $160 on MAC make up, $300 on clothes, loads of merchandise from the parks, ate at 4 table service, and ate counter service for lunch every day, had snacks every day like pretzels, popcorn etc, went to Universal, and sightseeing in Hollywood etc.
Our counter service for 3 averaged at $30, table service about $70. our 5 day Disney hopper and 1 day universal was paid in advance.
Hope this helps, there isnt a worse feeling that you wont have enough, but you will be fine!!