Sinus Pressure From Wearing Retainers?

I'd lost my retainers about a month ago, and only found them recently. When I did put them back on, not only did my teeth hurt, but a felt a pressure-like sensation in my face (most notably the cheeks, jaws, side of the head etc. - which were also related to TMJ disorder) is this normal if I hadn't worn my retainers in a while?