Not sure but I have taken Prozac for years and just recently have felt what you describe! It is maddening and am glad to hear it put into words! Couldn’t eat, had no appetite, felt sick.
Well, hard to want to eat when you feel that way. The last couple of days I think I found out why: I began to EAT a little instant oatmeal & shakes went away. Then I forgot when I ate last and realized a little oatmeal doesn’t go far so, I ate lunch. Then a light dinner.
Anyway, in my case I believe it is the autoimmune conditions that I have. SLE & Hashimoto’s officially but probably a lot of the diseases go into a little “remission” so I believe I have undiagnosed conditions as well.
Perhaps the Prozac has caused you to not want to eat? In my case, being allergic to so much, it’s depressing and I actually do not eat because nothing sounds good and I’m too tired to do anything but push the START button on the microwave!