Jinxed myself?

So I need to already be out the door but I'm so frustrated I'm afraid I won't get rid of this frown if I don't let it out by writing it down:

Did I jinx myself?
Binx is okay... but for 7 out of the past 8 days our other cat, our younger bigger cat, has vomited. I mean, there are now at least 20 spots on the living area carpet from her. I don't own a carpet shampooer so although I've cleaned up after her each time, it's still a mess. I had hoped and thought it was just her acting like a dog and woofing her food... so we reduced the amount she gets... but she just threw up mostly undigested cat food again.

I love our cats, but those with pets know that there is a balance involved in when you bring your pet to a veterinarian. The concern vs. cost ratio. The likelihood there's a problem vs likelihood the vet will charge you $90 to tell you that you're paranoid and it's simply hairballs. The pet owner gut always should win though. Unfortunately I'm waffling right now. I've been right with Binx - I've waited to take her but been right about something significant and treatable being wrong. And our vet is wonderful and thinks over my concerns and weeds out which are act-able and which (extremely few) are concerns that there's nothing to give a second thought to.

Little girl's lazy back stretch (yes, she's quite long/tall)

We don't feel any hardness in our Lucy's gut. She doesn't give us a pain indication. She is not stealing the other cat's medicated food (I've been watching like a hawk 'cause it would be the most likely culprit... but it's not). She's only 4 years old. Maybe "grandma" is right and she's caught a stomach bug or cold from my son or us. It's just normal to be concerned about any mammal vomiting for over a week. I don't want her to get dehydrated and feel worse 'cause of that. She's the baby girl of the house. I just want all of my family healthy. That includes her.

The question becomes whether or not I fill out and pay for pet insurance for Lucy before calling the vet tomorrow if she throws up again later.

Pet Care

At what point does pet insurance make sense?

A 18 year old cat who has racked up over $300 in vet bills, $200 in medication and is on 2 different medications  and needs subdural saline injections has me quite curious as to where our threshold on the issue will be.

An American Short-hair, in case you're curious about her breed. Hyperthyroidism and Renal disease are her diagnoses. She's a good old girl, a full fledged member of our household. She is the least likely of any of us to hold a grudge, tiniest, and in some moments, the only sane one in my house. 2 adults, 1 child and 2 cats and it's the old cat with all her claws who is the sanest and least likely to break anything. Her balance isn't even the best in the house yet she is the least likely to break anything. Go figure!

And while we're sorting paperwork, sorting photos and trying to get our studio up and running last week, this is what she gets to do, because she is, afterall, an elderly domestic cat.