Its never been this bad before...

Im studying for exams and honestly all I do is daydream I cant focus or do anything without it. Tasks that should be taking me an hour take three. When I listen to music I want to daydream. When its silence I want to daydream. I cannot stop and I dont want to stop for some reason. I want to stop because it is interfereing with my studying but if it didnt I would want to stop it. I used to be a 90s student and now this year because of my daydreaming I barely pay attention in class and barely manage to get a couple hours of study. Ive always daydreamed but for some reason this year it got so much worse and I dont know how to stop. My life is very stressful this year so its def because of that but damn it was NEVER this bad. I dont know what to do. How do i stop it, its never been this bad and it scares me. What do normal people think about like can they actually get their mind to shut up??? How do I achive this. I cant even go to therapy how do I fix this problem thats ruining my life please help.