Hi, Linda.
I hope the sneezing trick helps.
About appetite--I know exactly what you mean. I probably haven't had to be reminded to eat since the 1960s, but since the surgery I'm almost never actually hungry. At first, I found myself "running out of gas" pretty quickly, just like you.
On the other hand, a couple of days ago, when I was distracted by a work assignment, I absent-mindedly ate a decent-sized (but normal) meal--and suffered for the rest of the day from having over-eaten. That hadn't happened to me for maybe 10 years. I think my stomach has shrunk, so that I fill up much faster. Whatever. I've been cutting my portions, and not missing the extra food. It's cheaper this way, too!
What is pretty important, though, is to remember to drink. It's always a good idea to drink a fair amount of water, but I think it's even more important for us now that we've joined the one-kidney crowd.
Beyond that, I'm currently paying a lot of attention to sodium intake (my BP may be approaching borderline); this has altered my food habits, because previously I'd been more concerned about cholesterol. Either way, I kind of like needing to eat a lot less. I hope it lasts.
Good luck with your recovery, and congratulations on your donation!
Be well, Snoopy