baby sleep issues

For the past 3-4 days, my almost 11 weeks old girl has been waking up at night almost hourly-- not asking for milk as she falls back asleep immediately when i carry her. Her eyes remain closed throughout as well but fussing/cries. Tried patting her when she wakes up but her cries just get worse... and i would just carry her until she falls into deep sleep and put her down again. About 1h later she w wake again and the cycle w repeat. :( She used to be able to sleep a good 5h stretch each night prior to this, and would only wake up when hungry. What is happening? Any advice?