Alright, Shake.
I did some research.
In Saskatchewan, parental consent for
major medical treatments/procedures for people under the age of 18 is necessary.
however...
Minor treatments and the medication they require are considered (for those under 1

on a case by case basis. If someone is under the age of 18, but requires treatment for something they can't get permission for, or don't want to inform their parents about, the doctors can determine whether or not this treatment can be delivered. Saskatchewan doesn't have specific laws pertaining to appropriate age for certain treatments, but the law does stipulate that the patient must be informed...meaning they have to have a good idea of what's going on (and I'm pretty sure you meet this standard) In most cases, especially for those who are close to 18 years of age, doctor-patient confidentiality outside of parental knowledge is respected.
This means that you can go to the doctor... talk to them about your problem... describe your situation at home, and they will treat you.
And as for medication costs. Many times if you can't afford the medication, they'll give you sample packs. I got sample packs at first because I wasn't on a drug plan at the time (and because it's good to see if the medication actually works before you buy it).
Don't be afraid to ask if you have more questions!