FEEL SICK AFTER EATING?

So, I am 15 and a couple weeks ago i had lunch with my grandma. It was a big meal and i overate as i usually do ( i gained a ton of weight in the past year and have problems with binge eating and overeating) and then after i got a brownie sundae and obviously had a lot of sugar, soon after i felt like i had to poop and then i got nauseous and very hot, i got lightheaded and could barely move and felt like i was literally dying. my grandma turned on the ac in the car all the way and i just had to lay back and close my eyes and calm down and 30 minutes later i started to feel better. i was on my period so i thought maybe i lost too much blood but now even thought i’m not on my period whenever i eat i feel sick after, whether it’s just nausea or lightheaded. i don’t know what’s going on and i never feel good anymore. should i go to the doctor?