Does anyone feel off when their sugar gets high?

Noradun • 🌸Due in Sept 2019 with 🌈 after TTC 3.5 yrs with PCOS👣Mommy of 5 💑 Married for 14 yrs👩🏼‍🎓Graduating in 2019 👩🏼‍💻 WFH Mom 🌼

I am not diagnosed but am monitoring my sugars carefully and eating low carb most of time! At Sunday school this morning I was hungry and ate too many carbs! Went into church and the building was hot, we were out of bottled waters so I had nothing to drink, and I began to feel funny like I was going to pass out and the room was spinning! I tanned myself and it helped me survive church but I definitely felt cruddy! I am wondering if it was because of my sugar getting high or infact from me getting over heated!!