16 month old screaming ALL the time!

He is healthy, but literally demanding my attention ALL THE TIME. I HAVE to get assignments done for class, they would take 45-1 hr total but it’s impossible with my son climbing on everything and screaming and pulling on my and I feel so guilty but at this point little chunks of independent play shouldn’t so hard!! Idk if it’s a leap or allergies or what the heck is going on and when I try to hold him he head butts me then screams because it hurts both of us and I have no clue what to do or what’s wrong or causing this constant screaming and back to back tantrums. It makes it so hard to be as patient as I like to be. And to be honest I’m going freaking nuts. Any advice? Hellllp.