Wheelchair for sciatica?

Hi! I haven t been to the doctor yet, but i have this shooting pain down from my buttocks to my mid thigh. My aunt (a doctor) said she is pretty sure its a bad case of sciatica. It hurts REALLY bad but i have a good pain tolerance. The ONLY time is feels better is when i sit straight with good posture. Anytime i move it hurts, walking, standing, laying down, turning, moving my leg. ANYTHING HURTS. So i was wondering if my doctor will give me a wheelchair or not? I m 13 and i am still in school.