So sorry to hear about the cat, Momz - I've bene fortunate to not have had a cat with long term illness, but have known of other cats (like on here) that survive quite well with meds.
My cats (and dogs, and horses, and everything else over the years) have been dependent on my for their care, these are living beings to me that deserve a high priority of my attention and resources. Whatever I can afford that gives them a satisfactory standard of life I give without question.