His Tantrums Are So Bad My Helpers Left

Family usually visits to help when my partner works doubles. Having other people around and play with keeps my 9mo occupied so I can get food and laundry etc. Not today. The last week he's been a right bastard of non stop tantrums. He'll be smiling and then full on crying in a split fucking second. The family that came over to help last 30 mins and just couldn't take it anymore. So I'm stuck going insane. My ears hurt and have started ringing from all the god damn screaming he's been doing!! He's not sick, or feverish, or gassy, or teething. He saw the doctor Monday for his 9 month check in. He's ahead of his developmental curve by months. Too smart. He can take up to 5 steps already.