You do have symptoms of diabetes. It's tough to be taken seriously as a teenager. I get that.

Untreated diabetes can lead to ketoacidosis. You sound like you have a gut feeling about this, and you do have plenty of symptoms. So do this, test your own ketones. They're non-prescription urine test strips and they should be negative. If you're newly diabetic, they'll be through the roof. Go back to your mom and show her the dipstick results.

Some may recommend checking your sugar with a friend's meter, but the problem with that is that there's too much to consider when reading the results. It matters when you last ate, what it was, what time of day it is now, etc. You're not seasoned enough to consider all the variables.