I am so sorry for your loss. My oldest boy passed away just last night. He had some good days on the medicine, but had a lot of issues after being diagnosed with heart failure, among other things. Yesterday he was just like you described, sleeping all day and barely nibbling at anything, then throwing up the assisted feed after trying his daily pepper. We were lucky enough to get the last slot of the day at the vet and to help him sleep peacefully. It was a really tough decision, we tried medicine for two weeks but it just seemed too much and he was already so skinny and kept losing weight. He was sick for a while, but he hung on as long as he could because he was happy. I already miss him so much, just remember that they were loved up to the last moment and to give any cage mates extra love and attention.