This sounds exactly like depression. It can take on many forms and you've described many key features. Ones that are often misunderstood. No one here can diagnose you, but you were professionally diagnosed.

Moments of happiness can still occur even in severe depression. Please don't think you are over-reacting or being dramatic. You deserve some help for what you're going through. Regardless of what it is.

You said that "honestly, I don't want to talk to anyone". I'm hoping that's just because it hasn't gone well so far. Talking to someone who understands or who is capable of understanding is very important until you get that therapy.

Use the telephone crisis lines when it gets bad. If the telephone is too hard, try online chat crisis support. There are links here such as the grey box at the very bottom right of every page. There are also some links in the sticky threads at the top of the thread list for this forum.