Feeling faint after eating

Hello, is anyone else experiencing similar problem? Around week 12 I started feeling very faint everytime about 30 minutes after a meal. I feel like my heart is pounding extremely loud all over my body, I feel very weak that I need to sit and sometimes have a headache. It lasts about an hour. I thought it was changes in blood pressure, but blood pressure is normal. The larger the meal, the longer is lasts and the more I feel faint.

I had this in my last pregnancy also, but only after I ate something sweet, now it is after every meal.

Doctor has no clue 🤷‍♀️ anyone experiencing something similar?