What could cause a headache that starts after a heavy workout & begins with nose clogging up

Hi guys, for about a year now I’ve been getting these headaches that start at the back of my head and slowly go over my entire head. It always happens if I lay down after a heavy workout or doing intense things outside (like mowing my huge lawn).

Also, sometimes after a big workout my ears will clog up, and I can’t release the pressure, if I breathe in through my nose my ears feel like they’re going to pop. This only usually happens with intense exercise.

Any suggestions as to what is going on?

Thank you!