Before you really panic, I suggest you go to a big store like Wal-Mart (sorry if you're not in the States) and get your blood pressure checked. Also, talk to your parents since high blood pressure
is sometimes a genetic trait.
The symptoms you describe sound more like you were dehydrated - which also affects your blood pressure but makes it lower, not higher.
If you do have high blood pressure reduce the amount of red meat you eat, reduce your salt intake, and eat whole grain foods. Good luck!