Continued sleep regression from 4 thru 6 month :(

My baby used to sleep for 5-6 hours continuously at night when she was 3 months. She had a sleep regression at 4 months and it’s still continuing (she’ll turn 6 months tomorrow). It’s very difficult to put her to sleep at night and then she wakes up every 2-3 hours and feeds. Sometimes she’s awake for an hour or two and expects us to rock and comfort her past midnight. I’m exhausted and can’t wait for my baby to sleep through the night. Any suggestions?