Is it normal that i felt this way so suddenly?

I was heading towards the kitchen to make some Ice tea when I started to feel faint things were getting fuzzy then I quickly grabbed some honey nut Cheerios and put it in a bowl then I started feeling hot a sweaty along with dizziness and I felt weak. I said forget the food and ran to get some water. I started feeling alot better once I had cold water. I googled to see if I was dehydrated but I didn't have rapid heart beat or a dry sticky mouth. I don't know what that was but it wasn't because I was hungry. I had eatin breakfast before. From what I can tell about my eating lifestyle it's not that good. Most of the time I skip breakfast and eat only lunch and dinner. I take gummy vitamins and vitamin B-12. I haven't been drinking water that much lately. I eat sugary stuff a lot but I'm not over weight. I exercise every once in a while. Somtimes when I sleep for more than 8 hours I still feel tired. I don't know what's wrong with me?