Yes, I did an allergy test, but there was no strong reaction for anything, only a weak one for house dust. So we're not entirely sure if that's the cause, but it's worth trying out. Since there is no real season for house dust, I dunno how helpful that is, but I definitely do not want to change the pillow cases every day.
The thing with the vasseline sounds interesting, maybe I'll try that.
And I haven't tried using antihistamines cause I don't really have a strong allergic reaction. But maybe I can try if it helps when I'm feeling down.