I hope he's ok ... Hopefully he just got a hold of some bad food and it has nothing to do with his heart or anything like that.... He's in good hands now so hopefully all will be well, quick recovery ...
It was probably a food related intestinal distress. I think we have all been there. Better to be cautious at his age than to just "deal with it" till it passes.
I know I've had some serious gas & stabbing pains in my stomach that have made me wanna die. That shit is scary.