Poor Typhoon is sick

Typhoon has been suffering for the last couple of days of too much gas in his intestines... It seems that he has some blockage there. I feel so sorry for him :( He squeeled all night because he was in so much pain. But there was nothing I could do. He's been to the vet, and he takes medicine twice a day, I don't know if I can give him any painkillers or anything apart from what he has prescribed... :-(
I'm pretty certain it's because of all the rubbish that people throw on the grass. He probably ate a chewing gum, or whatever and now he's suffering. It's not his fault, he is a puppy and he grabs into his mouth whatever he sees because he is curious...
I don't understand how people can litter in a place where you have a bin every 10 metres... Guys, be responsible for your actions!