Im so sorry. I am going through this too
Im so sorry for your loss. I've read so much on cat cancer as of late. With my next pet, I will be sure to check her mouth often, get her annual teeth cleanings, which can help catch this very frequent cancer (oral scc) and feed her organic. Im so sorry. This sucks. I know if love could have saved your kitty, she would have lived forever.
I can imagine how you must feel. I have a 16 year old cat and he also keeps getting bouts of nausea. Each time I think it might be "that time" but he keeps coming out of it. He likes margarine and each time he quits eating I give him a little bit and it seems to help with his nausea and he just starts eating and drinking again. He lost his old buddy (and mine) a while back who was also 16 at the time so every day feels like a bonus now. After you spend around a third of your life with them, it's nearly the same as if they were a relative.
Yes, cancer often causes nausea.
Oh man...that doesn't sound good. I'm in the same boat: I have a couple of old Gentlemen who have shared the bad times with me, and they're getting on in years too