Sick Kitty

I came home from work early today to find out that Athena hasn't been herself today. Stacy said she's been throwing up and not eating and sitting in front of the water bowl all day today. I noticed on Monday that she wasn't too active, but that's not abnormal for her. So I'm taking her to the vet for the first time ever. I'm a little worried about what it's going to cost me, since my budget this month is pretty much maxxed after my trip to Kansas. And I'm worried that if she's really sick and it's going to cost a lot of money, I'm going to end up having to make the decision to put her down. I know it's premature to think about that now, but I'm a little worried. I just feel really bad for her, she looks so sick. :( Another 40 minutes to the vet...