Sounds like the onset of the 4 month sleep regression love. Things should settle down and go back to normal but how long it will last differs with each baby.
Fran has always woken once in the night and we have tried df a few times but she still woke in the night so she just ended up taking an extra bottle that she didn't really need.
About 3wks ago she started waking for an extra feed in the night so I know how you feel lol. After a few nights, when she started fussing, instead of going straight down to get her a bottle I tried popping her dummy back in and just waiting to see if she would settle first. She soon dropped that extra feed again and is back down to one a night.
I know df really works for some babies though, I hope it does for yours xx