It could be because you were sleeping all night- after some fluids you might feel better.
Plain aspirin? might help
you can't get to a store for the AZO type pills or cranberry juice?

If it hurts bad or for more than a day - you really should talk with your mom.

There shouldn't be any need for a invasive Dr appt.
just the pee in a cup type

[I am affraid to tell my parents because I do not want to go through the painful doctor visits again.
]