OK.

So, "Adolescents (12-18 years of age) may be prescribed sumatriptan nasal spray (10 mg)." - and the nasal spray works best when you are nauseous and cannot eat or drink.

This is from a UK source Triptans | Health | Patient.co.uk

I do not remember if you are in the US or UK, but if you are in the US, search to see if you can get sumatriptan at your age in the US.