I have a 15 year old cat who recently stopped eating and drinking the past two days he began throwing up bile and can't poop it came out of no where

I'm so sorry you're dealing with this. It sounds like your kitty is very ill. I would recommend taking him to an emergency clinic (or his regular clinic tomorrow if an emergency clinic is not possible) for an exam and labwork. This could be something treatable (or at least manageable, if not curable) or it may not be. I would be worried about kidney disease, thyroid disease, diabetes, cancer, and liver disease - it could definitely be other things too, but these are at the top of my list. Good luck with your kitty. Let me know if this was helpful advice or setup a consultation if you need further help.

Wow! That is old for a cat. If he is nearing the end of life, then the best thing to do is to make him comfortable. However you won't know that until you get some bloodwork done on him to check his organ function and red blood cells, for any abnormalities. It is very difficult to tell what he needs without knowing what is wrong, which is why testing may be needed for him. You can try offering him slightly warmed cans of baby food and non-flavored Pedialyte (diluted with some water) until you can get him in to be checked out. If it is his time and there is nothing that can be done, you will unfortunately be faced with having to make the decision for him or let him go peacefully at home. Poor guy. Billy has lived such a long life under your care, and you should be proud of that, even though you may have to say goodbye to him soon. But it is important to do what is best for him and to seriously consider letting him go peacefully and not letting him suffer.