Person A is really sick. Person B try's to help person A as much as possible.
Person B has a headache when person A bursts into their room making the headache worse they snap with a bad attitude.
Person A has been having a bad week and has been crying a lot resulting in them getting sick. Person B doesn't know how to help so they do what they can.
Person A was in their room in the dark for a long time staring at a computer/phone screen resulting in a terrible headache. Person B helps them a little, and gets them to hang out with the other sides.
