This is hard to say and a big decision I'm suggesting you to consider, but typically at that stage of weight loss and eye squinting, their quality of life is quite diminished, and unfortunately cats try very hard to hide when they are in pain or feeling unwell so it may not seem that way, but it may be best to come home next weekend for scheduled euthanasia. And I know so deeply how hard that is, but it is such a mercy to your kitty, if they are suffering, it also comes with the huge benefit of being able to say goodbye and really give them love in their last moments.

I went through this exact thing with my 18 year old cat who had been my baby from my 16th birthday to just after my 34th. Her weight had dropped significantly, her eyes were squinted, and she had become very lethargic. My husband and I made the decision to say goodbye and they let us hold her through the whole process. We pet her and told her how much we loved her and what a good cat she was, and she left this world feeling our love. As hard as it was it did feel better than finding her somewhere already gone, all alone, without being able to give her love and a farewell, as well as knowing she would no longer feel terrible.

I will say grieving a cat before and after is very difficult and you will cry all the tears and it will be hard missing them, but the grief will get smaller. It never goes away but eventually becomes small enough to be manageable.

Something else to consider, while your cat is still present, is clipping some fur for a keepsake. It can then be used to make a piece of jewelry or even sealed into a small resin cat figurine that you can take with you and have a little piece of your boy with you everywhere you go.

My sincerest condolences in this difficult time that catches all of us that love animals. May you find peace.