Hi! I am hoping someone can help before I end up wasting more money. After years of the same lightweight polyester duvet - I didn't change it because it was comfortable and not causing any problems - I bought a new polyester duvet. I've never had problems with polyester before. This is a thicker duvet than I've used in a long time, though. After the first night, I woke up snuffly (I also have perennial rhinitis) after the second night, I am aware my chest is tight, it can't be dust mites so quickly. Is it too warm? Should I invest in an anti allergy duvet? Should I revert to a very lightweight duvet? This could get expensive!