What would you suggest i do to cope with severe adhd at the age of 15?

ADHD can be treated : Stimulant medicines such as concerta, vyvanse (lisdexamfetamine) amongst other are very effective. Consult a doctor who is very familiar with this condition. A good psychiatrist will your best option.

Speak to doctor: Start by speaking to your pediatrician. They can help direct an evaluation of your problems and help to develop a treatment plan. Stimulant medications may go a long way to helping you. Cognitive behavioral therapists can helpyou develop strategies for managing the stresses related to ADHD and learning problems. Educational specialists can also help learn to deal with ADHD in school.