When you can sing but there's problems...

When you're just sitting in your room at 1:00 in the morning and then all of the sudden out of nowhere, you have a really good singing voice, just for your singing voice to sound like trash again the next day :,( 

Idk this has happened to me before, and it sucks because of the fact that it's temporary, and it sucks even more because I haven't voice trained, because I know 100 that it would sound MUCH better if I actually tried to voice train...