Extremely heavy periods with baseball sized blood clots

Every since I had my second When I first get my period the first 24hours are normal then get EXTREMELY heavy to the point I bleed through a ultra tampon a panty liner my underwear and pants and just soak everything within a hour. It’s so bad. That lasts a couple hours. Then the next day it’s literally so normal then turns light for the rest of my period. It comes very regular every month but for that few couple hours I feel like I’m bleeding to death and I have baseball sized blood clots come out. I have told my gyno and my pcp and had a sonogram done and they can’t tell me why this is happening. I take Motrin and it helps lighten it sometimes but this time I still bleed through just not as bad as usual 😭 idk what to do I’m at my wits end. Like what if this happens when I’m out or at work. I’ve been fortunate for it to only happen at home so far. But I’m so frustrated 😭😭 I’ve always had heavy periods but nothing like this. And I don’t want to be put on birth control I don’t like the way it makes my body feel. Thanks In Advance!! and please no mean comments 🙏🏼