I'm an idiot

So I havent been wearing my retainers for about 4-5, or possibly more, months and I just put them on again tonight. Yeah it hurt a little cause I know my teeth moved. So I woke up recently and I thought I'd take them off cause I normally get 6 hours of sleep but I'm on vacation right now so I'd get more. I just wanted to do it like my normal schedule. Anyway I take them off and I'm in the worst pain of my life. I'm fully awake, no going back to bed, and I had to pop two pain relievers that just are starting to work. I still feel the pain though. I'm wondering why it hurts so much worse taking off the retainers than putting them on.