Fussy Baby

The past two days my sweet girl has been sneezing a lot and I didn't know if it was normal so I called the pediatrician, we do have a lot of dogs so I was wondering if it were an allergy. She told me to pick up some saline and use that throughout the weekend four times a day or before I breastfeed. No problem. But the past two days she seems so fussy and I've tried everything. I feed her or try to sometimes she just latches on and sits there, I feel like I'm a pacifier, I change her diaper, I burp her, I check her temperature, make sure the temperature of the room is comfortable but she still won't stop fussing. I'm not sure what is wrong or what I am missing. I am a FTM and I'm not sure what to do when she gets this way. Idk if she is sick or not getting enough to eat. I am breastfeeding and have had no latching problems with her. Just feeling a little lost and somewhat overwhelmed.