Someone Help Me!!

My 2 month old is having this issue for the past almost two weeks where no matter what time I put her to bed she is waking up exactly an hour and a half after every feed. She will do this for 4 or 5 hours straight then she will sleep for 5 or 6 hours. She doesn’t even eat it most of the time. She either eats a tiny bit and falls asleep, just gags on it and screams when I take it away. I tried rocking, giving her a binky, changing her, changing her clothing thinking she was too warm, just letter her cry for a bit, just holding her. Nothing will calm her down. Someone please help for my sanity.