I just feel sian

I really really adore and love my 3MO girl. But... There's never a day that she doesn't cry murder. Even feeding her is hard now. She'll be drinking for awhile then suddenly cry murder for no reason. Afterwards, it'll be even harder to feed her. It's like i dont even know when she wants to eat anymore. When it had been 3hrs since her last feed and she's whining/crying, i give her the bottle and sudd she cries murder. Oh god, cant she just push the bottle away & dont cry., Leap or no leap, she loves to cry. I'm tired.. I'm bored.. i cant wait for maternity to end and be back to work.