It's your body's way of reacting to something traumatic or a major change in your life. If it's gotten worse recently, it's probably because of a depressive episode. If you have the resources, maybe you should try and reach out for help like therapy or medication. If you're in college, you can talk to someone there for free (that's what I'm doing) and it's covered in ur tuition. It just sounds like you've been struggling with depression most of your life... and it's like in episodic. Like it comes and goes and you can't control it, so you let your body control how it'll react to these episodes.

If you don't have those resources then maybe you can try and eat things that will make u have more energy instead of junk food. Im proud of u for still managing to eat something when u feel like this, but maybe it's worth a try to see how you'll feel.

Meal replacement's work well, I have been using something called Huel because I am unable to walk at the minute, that stuff is not the nicest tasting, but it has all your nutritional requirements, just sayin :)

I tend to feel like that as well. I find myself having no desire or no real motivation to eat or drink liquids sometimes. Even though there will be times where I tend to eat my feelings out or eat when I am bored..It really is the weirdest thing..Since I have never been able to point out the real cause.

You said you eat a lot of junk food. So you do eat, just not what is more healthy. Think about it,

Try not to let it worry you too much. Just makes things worse. When you are not hungry that’s ok. But as others have said when you DO eat try to avoid the junk food. When I don’t feel like eating but know I need to sometimes a can of Progresso soup will go down. It’s relatively healthy . Just a bit high in sodium.