My 16 (maybe 17) year old tortie cat Rose is constipated maybe has megacolon? This happened to her about a year ago. Had to take her to emergency where she had an enema. We changed some things around and were doing well.
The past Friday started out normal, when I got home from work she was hiding and had vomited, mostly food, around the house. She then postured like she was going to defecate and nothing happened. From my experience with her last time i figured she had a piece of poo stuck. Started her on lactulose and was going to call the vet in the morning. Being a holiday weekend her vet, and other vets were not open. I was forced to go to emergency. Because this was familiar to me, I opted not to do an x-ray (due to cost) and had an enema done with subcutaneous fluids and anti nausea with continuing lactulose and adding MiraLAX. She didn’t poop that night and the next morning she hadn’t peed either. She was also acting a little funny. Back to the ER we went. This time we did x-rays and bloodwork. She was full of poop. Vet said option 1 would be keeping her hospitalized with an enema every 6 hours with tube down her throat with a flow of miraLAX then re xray. Cost was well over $4,000, not to mention the stress. Option 2 we could do another enema but she didn’t think that she would pass the stool and basically suggested that I consider putting her down. Due to her age and the chronic nature of megacolon. After lots of tears and thought I asked if we could try the enema again more fluid, drain her bladder and keep up with the laxative routine. I wanted to give her a chance. So we proceeded. Vet was able to pull a lot of poop out and on the way home she passed two more pieces of stool, then later that night pooped again. She’s still a little off, but she went thru a lot the last couple days. I have a follow up appointment with my vet.
With what I have read about megacolon, I realize that at some point the mobility will be lost and surgery is the only option, with her age I don’t think that would be in her best interest
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But I also refuse to accept that I should be seeking euthanasia at this point. Is that wrong? Am I putting her thru way too much?

I would like to adjust her diet to a low residue and add cisapride to her regiment.
I know that was a long story to get to such a short question, but I am sure I am not alone in this. I just want to give her a fighting chance within reason. I uploaded her x ray, I’m not the most computer savvy so sorry for the roughness
Thank you to whomever takes the time to read this.