Feeling like shit after eating.. Suggestions as to why?

I feel like absolute shit after i eat most meals. Like I'm going to be sick. At first i thought it was my blood sugar so my mom gave me a machine for that. (I'm 25 weeks pregnant) And blood sugar is never high. So I don't know if it might be like preeclampsia or if it could be nothing. Anyone have any idea of what's going on?? I tried to talk to my dr but she just said they don't do the glucose test until im in my 3rd trimester and i felt like she was rushed and completely dismissed my concern.