Nerves. The brain and spinal cord are part of the CENTRAL nervous system, and the kidneys are part of the renal system.
Well, you have two options, either throw up now and not worry about it later (this relieves pain too), otherwise, just drink something and have something to eat. Don't try anything too sugary like one of those Starbucks unicorn drinks (I don't know if they still exist but hey, just a warning!). Try a soda or just plain water. For something to eat, try a corndog or something that you like. Most people like pizza, so try a nice greasy pizza!
That would be your own personal opinion bc everyone is different
You should comfort him, and ask him what's wrong. Treat him like any other person and try to find a solution to his problem. Be there for him so it makes him happy again :)
