Sounds like blood sugar and lactose intolerance. White bread and white rice are trash.
I love dairy and burgers. I am 90% sure I shouldn't eat dairy (or gluten) but dat shit be tasty. It's not usually a big enough concern anyway. Yes, vegetarian and vegan are healthy diets but there are worse things for you than a dead cow that are completely vegan. It doesn't help that there is shitload of misinformation on nutrition out there.