Opinion about my sick cat?

[CharlieHamHam]

I know this is a hamster forum, but I need someone’s second opinion.

Starting yesterday, my seemingly happy 2 year old cat started throwing up bile (stomach acid). He threw up about 3 times yesterday and had little appetite. His vomit did not contain any kibble so I think that his stomach is/was empty. As far as I know, Orion has not thrown up today and he was running around a little bit. He looks a little depressed, like he might be hurting. It is hard to tell if he is using the litter box, because I have another 2 year old cat.

Here is the catch... Orion has cat pica. If he can swallow something, he will eat it! I am very scared that he may have an intestinal infection/blockage and that he needs medical care. If anyone has any ideas, please comment! It breaks my heart when my baby is in pain.