You're not alone. Here lately it takes a deal of effort just for me to get out of bed; I'm constantly feeling very fatigued, nothing really sounds or seems interesting, and my mood has been low enough that I actually feel like just watching TV. I am very skilled, very talented, and there are literally a ton of different jobs and professions I could do, but because where I live not having a med school degree means my degree is pretty much worthless, and because my knee is bad I can't do the factories/warehouses/food processing plants that are the other ways of getting ahead. I can't even do fast food because I can't stand for more than a few hours of time, and all it will take is one slip to throw my knee in a bad position and make things much worse than they already are. I can't even drive trucks because even sitting for hours on end puts my knee in agonizing pain. I've put weight on from stress eating, and my birthdays are really only good for reminding me just how lonely I am.
It's good to hear you are feeling better though.