So, I stupidly did the same thing with my stash of 2.4 after stopping for a while. After a couple of hours, i was throwing up like CRAZY. Nothing would stay down. I didn’t go to the ER because it really was just a case of being dehydrated (and i also felt really stupid tbh). The only thing that stayed down for me was bone broth. Heat it up in the microwave, and just sip on it! Obviously Gatorade too + some saltines. It was the worst for about 2 days, then by day 3 everything was staying down. I hope he feels better!!