Thank you so much for your suggestions!
I tried a little around and my friend was actually able to login onto my account on the same region. I tried really everything. She then helped ordering my inventory a bit so maybe I would be able to log in but still did not work. We figured it might be an internet issue. My internet has sort of a stable connection but for some reason the download is really really slow. It took me 5 hours to download 500 MB when it was much faster a few days ago. So I believe my issue might be something with the net actually.
So at least it should not be an account issue. I was able to log onto an alt but even on my alt things seem slow. I can move fine but things take ages to load. Even joining a group or something like that was almost impossible, oddly enough.
So all I can do right now is probably wait until my internet decides to stop being silly, the next few days.