Need some advice please as cant get hold of midwife till tomorrow and didn't know if it was extreme enough to contact the hospital.

Lately after eating (not all the time but more and more frequently) I end up feeling really sick and my hands start shaking and I feel really lightheaded and dizzy. It happens literally within a few minutes of eating and dont know what it means? Any help would be greatly appreciated, first pregnancy so dont know what is considered "normal" or not x