Baby suddenly waking up every 2 hours

Hello! FTM here. My 5 week old suddenly started waking up every 1-2 hours at night when before she was only waking every 3-4 (she’d been waking like this since she was 2 weeks old). She’s also been eating less but a lot more often. Could this be a growth spurt or maybe something else? She also had a little 2 day phase of not wanting to take naps and ending up overtired at the end of the day right before she started doing this. Now this has been going on for three nights and I’m exhausted as she’s exclusively breastfed so I’m usually the only one tending to her at night. Please help! I don’t know what to do 😓