What Could Be The Reason For Severe Headache And Pressure With Vision Of White Spots When Holding Breath Or Straining?

Whenever i lay on my stomach i get this intense pressure in my head and a headache that goes up the back of my neck all the way to the front of my forehead, i also see white spots and can hear my heartbeat in my ears. Wondering why that is and if theres any need for concern? Also i get a pressure/headache every time i hold my breath and strain (example- lifting something or blowing up a balloon etc). It almost feels like I m going to burst something important. I also have a mild headache every morning. These symptoms are only recent. The last couple months.