Sorry but I forgot also ( I apologize I am a bit mental today) that it would be great if you got a special hoover. There are anti allergic ones (99% of dust stays inside the hoover) and even ones that deposit all the dust into water, they are great for vaccuuming the matress, it really makes a difference.
My pillows are M -Line Slowmotion III
I love them

Hope you find a solution soon!