Worried to death about my best buddy

My cat had been gagging for sometime and I thought she was trying to pass a hairball but nothing ever came up.  Then last week she seemed to take a turn for the worse and Sunday night was horrible for her.  She was gagging, had extremely labored breathing and very weak.  I let her rest on Monday then brought her to the vet on Tuesday.  He took an x-ray and told me that she has a lot of fluid around her heart and in her chest and sent us home with diuretics for her.  She is a gem in taking her meds hasn't spit up any so far.  She is taking her meds every 12 hours.  Her activity level is non-existent at this time and is still weak but not as bad as the beginning of the week.  Her eyes are bright and her breathing isn't as labored as before.  However, today (3d day on diuretics) she has not gone to the bathroom - should I be concerned? 

Age: 13 years

Breed: Torti

Eyes: bright and alert

Eating/Drinking:  definitely drinking and eating a little

Not ready to say goodbye to my best gal-buddy but will if she is suffering.

I would call the vet tomorrow and talk to him. As for saying goodbye, I believe you will know if and when the time is right. It is a hard thing to advise someone, since I am not her vet.

I am so sorry this is happening to you.

Please give the vet a call.  They will know best about the constipation.

God Bless you and your little gal pal.

This is terrible. I hope by the time you see this your fubaby has shown improvement and you have gotten some answers from the vet

It would be best to call the vet about her not using the litter box.
Cats can recover from congestive heart failure and do well for a time on meds. Our Jamie had about 17 months after his first bout (of 3) with it, so don't give up on her yet.

We would love to hear an update on your cat. Hope everything is better now.