Don't worry, they can carry on a bit. Pretty noisy and pretty singleminded. The season lasts from 24 to 48 hours and happens every 14 to 18 days, it varies slightly from pig to pig. So I'm afraid this behaviour will become recognised and commonplace after a bit, happening every couple of weeks.
The signs of real aggression are lunging and biting with blood drawn, menacing rumbles - they do sound different to rumble strutting - and really bad teeth chattering with an agressive pose. Teeth chattering more softly can also mean 'I want that bit of lettuce', or 'stop cleaning my ears it tickles', and so on. So they do use sounds in different ways. Just observe, understand their sound usage and be ready for this again!
And yes, mites can make them unhappy and stressed. Just imagine how you'd feel if you itched loads and had sore patches of skin!
Hope this helps, Sarah x