Hello Parkland, and welcome. Ask all you want, as much as you want.
The answer is 'you should be worried,' but blood sugar is dynamic. If you read 485, that does not mean that it still is 485.
As was said, you need to consult with your doctor, but first and foremost, relax, don't let stress make things worse. Stop eating what you are eating, and eliminate carbs and sugars, now. Look around here and on the web for foods you can eat, and only eat what is low carb until you can see your doctor. I could list all the bad things, but they are found everywhere on this forum and with a net search. Stop taking in carbs, and your blood sugar will come down.
Don't know your lifestyle or eating habits, or if you exercise or not
Its not fatal today or next week, so don't lose too much sleep over it. In fact, lousy sleep, can make BG levels rise, so don't get into a knot over it. Just stop eating the bad things. I don't mean forever, just until you get tested and diagnosed.
It will help your doctor a whole lot, if you can test your BG numbers every morning when you first get up, before you eat anything. These fasting numbers will tell a lot. In fact, tell us what you get if you do test. We just want to help if we can.
John