I understand the financial aspect - believe me!

Is he bringing anything up when he vomits? Is it after he eats? IS his food there, or does it look like something else? Hairballs sometimes look like individual pieces of hair in a yellowy substance, or they look like logs you'd think was poop. And they can be somewhere in between. Do you see whole pieces of food? Any grass or bugs or anything he might have eaten? Yes, it scary when your cat suddenly seems sick for the first time, for no apparent reason.

Lets get him through this crisis and then we can help you find low cost or FREE neuters for him. The younger you get him fixed, the better life he'll have - less risk of cancer, less risk of harm from getting out ot mate, less risk of territorial spraying in the house. There are free programs ouot there, you just need to know where to look. I promise!