My sweet little babe has just not been herself in over a week. She's been sick with a stuffy/runny…

My sweet little babe has just not been herself in over a week. She's been sick with a stuffy/runny nose, up a lot at night, and cries almost nonstop all day. She was the happiest little thing to play on the floor, sleeping all night, and just a happy baby. But for the past week she is just miserable. Even when I'm holding her and walking around she screams. I've tried calling her pediatrician but i get put on hold for over half an hour and with 4 kids i dont have time to waste on hold like that. I just dont know. She is never happy and just cries all day. Im going to take her to the walk in and see if maybe theres a hidden ear infection or something. Idk but i am almost at my own breaking point.