A little rant about life lately

Well recently enough i found out my dog might not (will not) live a full life. He has been dealing with idiopathic seizures since he was a kid. The medicines he takes for them makes him super sleepy. Apart from that, it also affects his liver and kidney. On top of all this he has now grown to be very weak. His hind legs are barely able to support him. He struggles to stand up from his bed let alone walk. Yet, whenever I see him he gets super excited and wants me to play with him but if I do play with him, his legs become swollen making it more painful for him. The worst part is he used to be a super playful, super energetic dog, but back then I used to easily get irritated because he just used to keep running and biting me to play with him. I wish I could play the same way with him again. I honestly regret not playing with him, not loving him more when he was healthier. I mean it's just that he already has a very limited lifespan now, and that too now he is semi bed ridden. I've been crying every night for the past entire week. I just want that boi to get better. He has suffered a lot, and honestly it makes my heart shatter seeing him suffer more and more. I've got no one to share it with per se, so posting it here. I mean I have my partner but she herself is dealing with a lot at the moment and i really don't want to add on to that but I just needed to vent this out man.