Palpitations and high heart rate after I eat

is this normal for someone who has POTS? i've been getting dizzy, lightheadedness and presyncope episodes in 1 month. i have my doctor appointment tomorrow. but i feel other symptoms such as getting SOB/air hunger, fatigue, high heart rate, and palpitation every time after i eat a meal.

*i also tried to measure my HR from lying down to standing up. it increased to 3-40+ bpm*