Fussiness

Anyone else’s 3 month old super fussy? My LO eats constantly and when she’s not eating she’s crying or screaming. She is usually quite happy and cheerful but for the past week or so she has been super fussy and won’t calm down for anything sometimes but when she is calm she seems really happy and talkative but then cries for seemingly no reason even after being fed and changed. She had just started sleeping for longer periods but is now back to waking up every hour and a half at night, which is really frustrating. It’s usually fine but I’m starting to feel like I’m a terrible mom and that she doesn’t really like me sometimes.