3 month old waking every hour

My 12 week old baby is suddenly waking every single hour during the night. She was sleeping really well and only waking up 1-2 times a night. And she wants to nurse CONSTANTLY. She also won't nap anywhere other than me during the day and won't take a pacifier anymore. I used to swaddle her, put her in her swing, & give her a paci and she would sleep for 2-3 hours! What's going on :( I'm exhausted!