This is always a good sign and a good thing no matter what. You're recovering from something, in some area at least. We know our mental fortitude and health is like a structure where one thing supports another. One thing crumbles, and another gets weak. But also when one thing gets stronger, it will support the weaker ones.
Take this small victory and embrace it, it's a good thing. We can thank God for these little things that often turn out to be bigger than they seem. Clarity, appetite, very good things. And if you enjoy the taste of food, you have tapped into enjoyment again. If you haven't enjoyed anything in years, this little thing here is actually a big thing. You are now able to enjoy at least something! Later on you could be enjoying some other things too. So many times the best things to enjoy are the simplest ones, the ones we tend to take for granted. But if we lose our ability to enjoy then, and then get it back - or at least some of it - then we know how precious they are and we can truly enjoy these things. It's like slowly getting some footing into good reality, with small steps, but these steps will make a good strong path in the long run.
It's common in depression to lose all enjoyment and even feeling, to feel like a dead person walking - if they're even able to walk, some depressed people are almost bedridden and can't seem to be able to function or to even perform basic trivial tasks. Most people still have this pressing sense of melancholy and sadness, so it's not very common to be absolutely emotionless, but everything's possible. Our brain is a strange thing. And yeah, some medication can make things worse. Out of all meds that I had for my depression, I didn't settle for the one that I felt helping me most, but for the one that bothered me the least. But who knows, perhaps something good came out of it. It's just so damn hard to tell when you're in the thick of it. When I was on a cocktail of many meds, I was like a drooling zombie at times. Just existing, and doing even that badly.
Will be praying for you brother. I hope your psychiatrist takes you seriously and doesn't just shove meds down your throat, and that you'd actually have some other ways to deal with this too. If you don't have emotion, don't worry about it, since you can't force it and it's not in your control. There's just something not clicking in your brain. We don't need emotion to go to God as we are, and we don't need feeling to love each other in truth and action. In many cases, such as mine, emotion is distracting, especially when I respond to fear and anxiety almost with a primordial force and it can be hard to handle. Anyway, you have a little victory here, it's a very good thing, and these little things are paving way for other things in time. God bless you and Christ be with you.