Not liking the things I used to love

I have chronic fatuige and I was wondering if it makes you stop liking the things you used to like and also if it makes you have no motivation. Because I have a horse and I got it just before my Chronic Fatuige got really bad. I have no motivation to ride or do anything and I have stopped like him a little bit. Some days I like doing stuff with him and then sometimes I don't. I really need help because I hope I am not loosing interest in him because I have loved horses all my life and I want them to be a big part of my life(well sometimes. I think this may be because of the not liking the things that you used to like with chronic fatuige. If that is true)