Food goes up to throat?

I'm dealing with anxiety but I don't know what's going on here. I am 18 years old. Every time I eat I feel alright but then an hour later I feel the food going up to my esophagus and I feel nausea. I'm thinking is GERD Acid Reflux but I don't really get too much heartburn althought I get tight chest feeling and such. But I don't know. Someone please tell me what it is. Thanks.