Okay so if I eat either too much or too sweet, I get really nauseated and feel very antsy...

I start shaking my legs as if I have restless leg and Rick back and forth.. This lasts about an hour or so after... And starts as soon as I'm finished eating. I'm 29+1 preggo and its been like this for a few weeks. I try to lay down but it gets awful and sometimes I feel like I'm going to throw up. Anyone know what this is? I'm just going to have to eat smaller meals I guess.