- And got the T-shirt
Both Lynx and I have explained to you how VERY important it is that a guinea pig eat all the time, and that he will die if he doesn't. But you've decided that it might be painful for him to store that much food. But you're severely underfeeding him.
If you want this pig to have a chance at living, you MUST handfeed him. And you must feed him enough to keep his gut moving. If you don't, he'll either develop fatal stomach ulcers (they eat holes all the way through the stomach), or he'll develop bloat and die from that.