I have had the same experience. Lost much of my sense of smell and taste for some reason over the holidays last year. I've lost a few pounds, but kept my desire to eat, even if it isn't as much fun as it used to be. I have a reputation to maintain after all (LOL!). But I do have to have hubby do the final tasting of most meals I put on the table (I'll over-salt because that is one thing that tastes great to me). But as I'm watching my mom starve to death, I've learned you have to do what is good for your body, and to take joy in it. So ..... I keep hoping my smeller and taste buds come back. Meanwhile, I still eat, drink, love, and generally enjoy. It isn't as good as it used to be, but what the heck?
As far as motivation, love and friendship. I recently spent a few weeks cooking for Daddy and every time we got up from dinner I was praised to high heaven. My husband never fails to praise my cooking. One dinner I would have considered a minor failure was gobbled up by Hubby, Dad, and Sis. Not a scraping of the bowl left. The best motivation for good cooking is an appreciative audience.