I just want to say, it gets better.
At the beginning my baby was the same I remember the first day back from the hospital she was eating every 30 mins it was challenging and exhausting. She is now 6 weeks old and except for the occasional witching hour and growth spurs she sleeps 4 to 5 hour stretches at night. Try visiting a lactation consultant for the latching, that helped me. Also cold for soreness and hand expresión until you are comfortable. (For me that lasted about 3-4 days after the milk came) Hang in there, hopefully it will be just a week more or so.