The roof of my mouth itches a lot it's been getting very bad my left nostril had been itching to I have now seen little red dots in my mouth?

Allergy related. It's not unusual for a person with seasonal allergies to have an itchy palate, nose and even itchy eyes. If symptoms last for more than 10 days or get worse instead of better, see your PCP for investigation.
Dentist Visit Now. From your symptoms, I would be seen by your Dentist immediately. You could be having an allergic reaction, but your age is more primary for other 'socially contractible' pathologies and diseases. Go get a check-up, sooner rather then later. I hope everything is fine!