nauseous a lot after 2 to 3 years after gallbladder removal

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hi i’m a 13 year old and i had a gallbladder removal about 2 to 3 years ago. and i get nauseous time to time when i don’t eat for a long time or eating greasy food. on the 28 of december 2017 i didn’t eat for about 6 to 7 hours and the first thing i ate was obviously bad food like ice cream with whip cream and a cupcake from walmart. after that for the past few days i’ve been nauseous so i took pepto-bismol and it helped. but yesterday i ate at 11 at school and then i didn’t eat again until 5 because i had to study there. but i only ate an apple with peanut butter and a blueberry muffin. i was nauseous after an hour and at 7 i tried eating and we ha subway and i just couldn’t so i thought the sandwich just had too much grease so i tried eating cereal and i couldn’t eat it. so i took pepto-bismol but i was just so done i tried throwing up so my mom gave me water with lime, sugar, and baking soda to make me puke. it actually helped with the nausea but i kept on gagging like i wanted to puke but nothing won’t come out. idk if it’s because i haven’t eaten anything but i just need help. i’m done feeling like this