I was at walmart literally shaking when at the cashier. My legs felt extremely heavy and I had to…

I was at walmart literally shaking when at the cashier. My legs felt extremely heavy and I had to sit on a bench they have not far from where I was. Then I went to the car and could barely get my kids in the car and everything else. I had to sit there for a minute and didnt think I could drive home. Luckily I could but I felt like I was going to puke the entire time. Almost 3 hours ago and I feel a little better but still dizzy. Trying to drink a lot of water I am probably dehydrated but it is the worst feeling......