I feel drunk after eating sugar today

36, female, UK. 5' 5" 180lbs. Meds - amitriptyline, fluoxetine, lisdexamfetamine. No allergies. Today i made a cake for my sons birthday. I ate two slices. Red velvet with buttercream frosting. Started feeling sick, wasn't surprised - had just eaten two slices of cake. Then started to feel really lightheaded. then started to feel drunk. Not fully drunk, like when you're tipsy but on the way to definitely being drunk. It's been about an hour and a half and I still feel the same. I have to keep rewriting words because it's like typing after drinking getting words wrong. My head hurts a little. I feel tired. I feel like I have motion sickness. I feel like when you drink and then you cant stand up because the world starts tilting and it makes you feel sicker. But if you sit down and don't move you can kind of keep yourself stable. Do you know what I mean? In scared this means I have diabetes. I tried to attach my last hbac1s but it didnt work. They are all between 33 and 35 and it says normal is 21-41.it says normal but the number isn't exactly low and I do eat a lot of carbs. I do sometimes randomly feel sick and lightheaded but it's not usually triggered by food or sugar that I've noticed. Have I overdosed on sugar? I thought I'd feel better by now. I also had mini eggs today and a glass of Pepsi max earlier. Thank you