I feel you Mama. Sleep deprivation can do a number on us! If we don't sleep well, it feels like everything else starts to fall apart. Know that baby not sleeping through the night is pretty normal. Some babies are like that. I went through it with my first born, not with my second! Do you by any chance cosleep? Cosleeping helped a lot in that situation since baby was able to regulate and feel safer next to me. He would go back to sleep faster. But that's a personal choice. Try talking to someone of you can. A support group, counseling, or therapy. Since you are sleep deprived, make sure you are getting some good nourishing foods in you. Whatever you can manage, little by little. It's important, so it makes you feel better physically and mentally. Try some breathing exercises, especially when you have that "jump off a cliff" feeling. There are so many examples and tutorials now on YouTube and apps. It can get very overwhelming all of a sudden, but once you get a handle on at least one thing...
...everything else will start to fall into place. Just know that you aren't alone in this experience. Know that it will pass (even though it sounds cliché, I know) and try finding at least ONE thing that you enjoy doing JUST for you on a daily basis. No matter how simple it is. It helps with feeling like your own person again.
Sleep is very essential , a lack of sleep will have you feeling a certain way. My 13 month old still drink 3 bottles overnight but he goes right back to sleep. To set up a routine where you shower and wet her hair then give a warm bottle. Use a very dim light and a soothing music box if you have one. Cut out naps after 4pm and try to keep her up until her bath time. Routine is very important if you intent on getting any sleep at all.
Aww girl.. I'm with you on the sleep thing. It's exhausting especially as I'm back at work next month 🥹.. Hope it gets better soon for you 💕