I don't know what's wrong with the baby. It's been three days like thi…

I don't know what's wrong with the baby. It's been three days like this, can't go to sleep at night and all. Terrible tantrums start, because of that he sweats and everything gets worse. Not in a sling, not in a crib, not on his hands, just like that, never seen anything like it before. We try to put him down for the second hour already for the third day and he sleeps until 11 o'clock. I don't even know what to do anymore, we used to get up at 8-9 and everything was good. Could there be regression at three months? I think it's too early for him. The tummy has passed by now